Rare parts in 21355-1: The Evolution of STEM

This set inventory has been obtained from LEGO Customer Services replacement parts page. It was retrieved on 28 July 2025 and contains 876 pieces.

Important note: We do not control this inventory and cannot currently make changes to it. Use it as a guide to the contents of the set, or to find out part numbers when requesting replacements.

Element Image Qty Colour Category Design Element name Element
in sets		 Element
introduced in		 Design
in sets		 Design
introduced in
6527761 <h1><a href='/parts/6527761/flat-tile-1x2-no-483'>FLAT TILE 1X2, NO. 483</a></h1><div class='tags floatleft'><a href='/parts/6527761/flat-tile-1x2-no-483'>6527761</a> <a href='/parts/design-111402'>111402</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Plates'>Plates</a> <a href='/parts/colour-Aqua'>Aqua</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

FLAT TILE 1X2, NO. 483

6527761 111402 System Plates Aqua 2025
©2025 LEGO Group
« Previous Next »
2 Aqua Plates 111402 FLAT TILE 1X2, NO. 483 3 2025 3 2025
6541885 <h1><a href='/parts/6541885/outer-cable-200-mm'>OUTER CABLE 200 MM</a></h1><div class='tags floatleft'><a href='/parts/6541885/outer-cable-200-mm'>6541885</a> <a href='/parts/design-112938'>112938</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Cables-Hoses-Strings'>Cables, Hoses & Strings</a> <a href='/parts/colour-Black'>Black</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

OUTER CABLE 200 MM

6541885 112938 System Cables, Hoses & Strings Black 2025
©2025 LEGO Group
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1 Black Cables, Hoses & Strings 112938 OUTER CABLE 200 MM 2 2025 2 2025
6546834 <h1><a href='/parts/6546834/mini-upper-part-no-7575'>MINI UPPER PART, NO. 7575</a></h1><div class='tags floatleft'><a href='/parts/6546834/mini-upper-part-no-7575'>6546834</a> <a href='/parts/design-76382'>76382</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Parts'>Minifigure Parts</a> <a href='/parts/colour-Black'>Black</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

MINI UPPER PART, NO. 7575

6546834 76382 System Minifigure Parts Black 2025
©2025 LEGO Group
« Previous Next »
1 Black Minifigure Parts 76382 MINI UPPER PART, NO. 7575 1 2025 10224 1993
6544403 <h1><a href='/parts/6544403/brick-2x6x1-inv-arch'>BRICK 2X6X1, INV. ARCH</a></h1><div class='tags floatleft'><a href='/parts/6544403/brick-2x6x1-inv-arch'>6544403</a> <a href='/parts/design-6806'>6806</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Bricks'>Bricks</a> <a href='/parts/colour-Brick-Yellow'>Brick Yellow</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

BRICK 2X6X1, INV. ARCH

6544403 6806 System Bricks Brick Yellow 2025
©2025 LEGO Group
« Previous Next »
6 Brick Yellow Bricks 6806 BRICK 2X6X1, INV. ARCH 1 2025 15 2025
6544404 <h1><a href='/parts/6544404/brick-1x2x1-2-3-bow-w-cutout-no-1'>BRICK 1X2X1 2/3, BOW W/ CUTOUT, NO. 1</a></h1><div class='tags floatleft'><a href='/parts/6544404/brick-1x2x1-2-3-bow-w-cutout-no-1'>6544404</a> <a href='/parts/design-5907'>5907</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Bricks'>Bricks</a> <a href='/parts/colour-Brick-Yellow'>Brick Yellow</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

BRICK 1X2X1 2/3, BOW W/ CUTOUT, NO. 1

6544404 5907 System Bricks Brick Yellow 2025
©2025 LEGO Group
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12 Brick Yellow Bricks 5907 BRICK 1X2X1 2/3, BOW W/ CUTOUT, NO. 1 2 2025 42 2024
6544405 <h1><a href='/parts/6544405/brick-w-bow-1x6x1'>BRICK W/ BOW 1X6X1</a></h1><div class='tags floatleft'><a href='/parts/6544405/brick-w-bow-1x6x1'>6544405</a> <a href='/parts/design-6801'>6801</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Bricks'>Bricks</a> <a href='/parts/colour-Brick-Yellow'>Brick Yellow</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

BRICK W/ BOW 1X6X1

6544405 6801 System Bricks Brick Yellow 2025
©2025 LEGO Group
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4 Brick Yellow Bricks 6801 BRICK W/ BOW 1X6X1 2 2025 11 2025
6537695 <h1><a href='/parts/6537695/3-2-holder-w-knob'>3.2 HOLDER, W/ KNOB</a></h1><div class='tags floatleft'><a href='/parts/6537695/3-2-holder-w-knob'>6537695</a> <a href='/parts/design-5264'>5264</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Connectors'>Connectors</a> <a href='/parts/colour-Bright-Blue'>Bright Blue</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

3.2 HOLDER, W/ KNOB

6537695 5264 System Connectors Bright Blue 2025
©2025 LEGO Group
« Previous Next »
6 Bright Blue Connectors 5264 3.2 HOLDER, W/ KNOB 3 2025 70 2025
6548959 <h1><a href='/parts/6548959/cross-axle-extension-2m'>CROSS AXLE, EXTENSION, 2M</a></h1><div class='tags floatleft'><a href='/parts/6548959/cross-axle-extension-2m'>6548959</a> <a href='/parts/design-59443'>59443</a> <a href='/parts/platform-Technic'>Technic</a> <a href='/parts/category-Connectors'>Connectors</a> <a href='/parts/colour-Bright-Bluish-Green'>Bright Bluish Green</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

CROSS AXLE, EXTENSION, 2M

6548959 59443 Technic Connectors Bright Bluish Green 2025
©2025 LEGO Group
« Previous Next »
5 Bright Bluish Green Connectors 59443 CROSS AXLE, EXTENSION, 2M 1 2025 1863 2005
6468472 <h1><a href='/parts/6468472/flat-tile-1x1-no-304'>FLAT TILE 1X1, NO. 304</a></h1><div class='tags floatleft'><a href='/parts/6468472/flat-tile-1x1-no-304'>6468472</a> <a href='/parts/design-106298'>106298</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Plates'>Plates</a> <a href='/parts/colour-Bright-Green'>Bright Green</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

FLAT TILE 1X1, NO. 304

6468472 106298 System Plates Bright Green 2025
©2025 LEGO Group
« Previous Next »
1 Bright Green Plates 106298 FLAT TILE 1X1, NO. 304 1 2025 1 2025
6531638 <h1><a href='/parts/6531638/beam-2m-w-cross-axle'>BEAM 2M, W/ CROSS AXLE</a></h1><div class='tags floatleft'><a href='/parts/6531638/beam-2m-w-cross-axle'>6531638</a> <a href='/parts/design-7244'>7244</a> <a href='/parts/platform-Technic'>Technic</a> <a href='/parts/category-Technic-Beams'>Technic Beams</a> <a href='/parts/colour-Bright-Red'>Bright Red</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

BEAM 2M, W/ CROSS AXLE

6531638 7244 Technic Technic Beams Bright Red 2025
©2025 LEGO Group
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22 Bright Red Technic Beams 7244 BEAM 2M, W/ CROSS AXLE 1 2025 6 2025
6544408 <h1><a href='/parts/6544408/3-2-shaft-w-5-9-ball'>3.2 SHAFT W/ 5.9 BALL</a></h1><div class='tags floatleft'><a href='/parts/6544408/3-2-shaft-w-5-9-ball'>6544408</a> <a href='/parts/design-67692'>67692</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Connectors'>Connectors</a> <a href='/parts/colour-Dark-Azur'>Dark Azur</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

3.2 SHAFT W/ 5.9 BALL

6544408 67692 System Connectors Dark Azur 2025
©2025 LEGO Group
« Previous Next »
3 Dark Azur Connectors 67692 3.2 SHAFT W/ 5.9 BALL 2 2025 214 2017
6352997 <h1><a href='/parts/6352997/flat-tile-2x2-round-no-1211'>FLAT TILE 2X2, ROUND, NO. 1211</a></h1><div class='tags floatleft'><a href='/parts/6352997/flat-tile-2x2-round-no-1211'>6352997</a> <a href='/parts/design-79403'>79403</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Plates'>Plates</a> <a href='/parts/colour-Medium-Stone-Grey'>Medium Stone Grey</a> <a href='/parts/year-2021'>2021</a></div><div class='floatright'>©2021 LEGO Group</div>

FLAT TILE 2X2, ROUND, NO. 1211

6352997 79403 System Plates Medium Stone Grey 2021
©2021 LEGO Group
« Previous Next »
1 Medium Stone Grey Plates 79403 FLAT TILE 2X2, ROUND, NO. 1211 3 2021 3 2021
6530023 <h1><a href='/parts/6530023/mini-bottle-w-knob'>MINI BOTTLE, W/ KNOB</a></h1><div class='tags floatleft'><a href='/parts/6530023/mini-bottle-w-knob'>6530023</a> <a href='/parts/design-2608'>2608</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Accessories'>Minifigure Accessories</a> <a href='/parts/colour-Multicombination'>Multicombination</a> <a href='/parts/year-2023'>2023</a></div><div class='floatright'>©2023 LEGO Group</div>

MINI BOTTLE, W/ KNOB

6530023 2608 System Minifigure Accessories Multicombination 2023
©2023 LEGO Group
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1 Multicombination Minifigure Accessories 2608 MINI BOTTLE, W/ KNOB 3 2023 7 2018
6488484 <h1><a href='/parts/6488484/tile-4x4'>TILE 4X4</a></h1><div class='tags floatleft'><a href='/parts/6488484/tile-4x4'>6488484</a> <a href='/parts/design-1751'>1751</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Plates'>Plates</a> <a href='/parts/colour-Reddish-Brown'>Reddish Brown</a> <a href='/parts/year-2024'>2024</a></div><div class='floatright'>©2024 LEGO Group</div>

TILE 4X4

6488484 1751 System Plates Reddish Brown 2024
©2024 LEGO Group
« Previous Next »
1 Reddish Brown Plates 1751 TILE 4X4 2 2024 83 2022
6492629 <h1><a href='/parts/6492629/handle-no-4'>HANDLE, NO. 4</a></h1><div class='tags floatleft'><a href='/parts/6492629/handle-no-4'>6492629</a> <a href='/parts/design-1941'>1941</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Accessories'>Minifigure Accessories</a> <a href='/parts/colour-Reddish-Brown'>Reddish Brown</a> <a href='/parts/year-2024'>2024</a></div><div class='floatright'>©2024 LEGO Group</div>

HANDLE, NO. 4

6492629 1941 System Minifigure Accessories Reddish Brown 2024
©2024 LEGO Group
« Previous Next »
1 Reddish Brown Minifigure Accessories 1941 HANDLE, NO. 4 3 2024 31 2022
6546832 <h1><a href='/parts/6546832/mini-upper-part-no-7574'>MINI UPPER PART, NO. 7574</a></h1><div class='tags floatleft'><a href='/parts/6546832/mini-upper-part-no-7574'>6546832</a> <a href='/parts/design-76382'>76382</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Parts'>Minifigure Parts</a> <a href='/parts/colour-Reddish-Brown'>Reddish Brown</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

MINI UPPER PART, NO. 7574

6546832 76382 System Minifigure Parts Reddish Brown 2025
©2025 LEGO Group
« Previous Next »
1 Reddish Brown Minifigure Parts 76382 MINI UPPER PART, NO. 7574 1 2025 10224 1993
6510154 <h1><a href='/parts/6510154/design-element-deg-135-w-crosshole-no-3'>DESIGN ELEMENT,DEG.135,W/ CROSSHOLE,NO.3</a></h1><div class='tags floatleft'><a href='/parts/6510154/design-element-deg-135-w-crosshole-no-3'>6510154</a> <a href='/parts/design-5489'>5489</a> <a href='/parts/platform-Technic'>Technic</a> <a href='/parts/category-Connectors'>Connectors</a> <a href='/parts/colour-Reddish-Brown'>Reddish Brown</a> <a href='/parts/year-2024'>2024</a></div><div class='floatright'>©2024 LEGO Group</div>

DESIGN ELEMENT,DEG.135,W/ CROSSHOLE,NO.3

6510154 5489 Technic Connectors Reddish Brown 2024
©2024 LEGO Group
« Previous Next »
1 Reddish Brown Connectors 5489 DESIGN ELEMENT,DEG.135,W/ CROSSHOLE,NO.3 3 2024 31 2024
6483787 <h1><a href='/parts/6483787/cross-axle-extension-2m'>CROSS AXLE, EXTENSION, 2M</a></h1><div class='tags floatleft'><a href='/parts/6483787/cross-axle-extension-2m'>6483787</a> <a href='/parts/design-59443'>59443</a> <a href='/parts/platform-Technic'>Technic</a> <a href='/parts/category-Connectors'>Connectors</a> <a href='/parts/colour-Reddish-Orange'>Reddish Orange</a> <a href='/parts/year-2024'>2024</a></div><div class='floatright'>©2024 LEGO Group</div>

CROSS AXLE, EXTENSION, 2M

6483787 59443 Technic Connectors Reddish Orange 2024
©2024 LEGO Group
« Previous Next »
5 Reddish Orange Connectors 59443 CROSS AXLE, EXTENSION, 2M 2 2024 1863 2005
6546844 <h1><a href='/parts/6546844/mini-upper-part-no-7576'>MINI UPPER PART, NO. 7576</a></h1><div class='tags floatleft'><a href='/parts/6546844/mini-upper-part-no-7576'>6546844</a> <a href='/parts/design-76382'>76382</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Parts'>Minifigure Parts</a> <a href='/parts/colour-Sand-Green'>Sand Green</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

MINI UPPER PART, NO. 7576

6546844 76382 System Minifigure Parts Sand Green 2025
©2025 LEGO Group
« Previous Next »
1 Sand Green Minifigure Parts 76382 MINI UPPER PART, NO. 7576 1 2025 10224 1993
6547112 <h1><a href='/parts/6547112/mini-wig-no-13'>MINI WIG NO. 13</a></h1><div class='tags floatleft'><a href='/parts/6547112/mini-wig-no-13'>6547112</a> <a href='/parts/design-5958'>5958</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Parts'>Minifigure Parts</a> <a href='/parts/colour-Sand-Yellow'>Sand Yellow</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

MINI WIG NO. 13

6547112 5958 System Minifigure Parts Sand Yellow 2025
©2025 LEGO Group
« Previous Next »
1 Sand Yellow Minifigure Parts 5958 MINI WIG NO. 13 3 2025 10 2021
6527760 <h1><a href='/parts/6527760/flat-tile-1x1-round-no-344'>FLAT TILE 1X1, ROUND, NO. 344</a></h1><div class='tags floatleft'><a href='/parts/6527760/flat-tile-1x1-round-no-344'>6527760</a> <a href='/parts/design-111401'>111401</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Plates'>Plates</a> <a href='/parts/colour-Transparent'>Transparent</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

FLAT TILE 1X1, ROUND, NO. 344

6527760 111401 System Plates Transparent 2025
©2025 LEGO Group
« Previous Next »
1 Transparent Plates 111401 FLAT TILE 1X1, ROUND, NO. 344 1 2025 1 2025
6548957 <h1><a href='/parts/6548957/leaf-2x6x1-no-1'>LEAF 2X6X1, NO. 1</a></h1><div class='tags floatleft'><a href='/parts/6548957/leaf-2x6x1-no-1'>6548957</a> <a href='/parts/design-3565'>3565</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Animals-Nature'>Animals & Nature</a> <a href='/parts/colour-Transparent'>Transparent</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

LEAF 2X6X1, NO. 1

6548957 3565 System Animals & Nature Transparent 2025
©2025 LEGO Group
« Previous Next »
2 Transparent Animals & Nature 3565 LEAF 2X6X1, NO. 1 2 2025 56 2023
6527753 <h1><a href='/parts/6527753/mini-head-no-4570'>MINI HEAD, NO. 4570</a></h1><div class='tags floatleft'><a href='/parts/6527753/mini-head-no-4570'>6527753</a> <a href='/parts/design-111394'>111394</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Parts'>Minifigure Parts</a> <a href='/parts/colour-Umber-Brown'>Umber Brown</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

MINI HEAD, NO. 4570

6527753 111394 System Minifigure Parts Umber Brown 2025
©2025 LEGO Group
« Previous Next »
1 Umber Brown Minifigure Parts 111394 MINI HEAD, NO. 4570 1 2025 1 2025
6544409 <h1><a href='/parts/6544409/cross-axle-extension-2m'>CROSS AXLE, EXTENSION, 2M</a></h1><div class='tags floatleft'><a href='/parts/6544409/cross-axle-extension-2m'>6544409</a> <a href='/parts/design-59443'>59443</a> <a href='/parts/platform-Technic'>Technic</a> <a href='/parts/category-Connectors'>Connectors</a> <a href='/parts/colour-Vibrant-Coral'>Vibrant Coral</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

CROSS AXLE, EXTENSION, 2M

6544409 59443 Technic Connectors Vibrant Coral 2025
©2025 LEGO Group
« Previous Next »
5 Vibrant Coral Connectors 59443 CROSS AXLE, EXTENSION, 2M 3 2025 1863 2005
6490255 <h1><a href='/parts/6490255/mini-lower-part'>MINI LOWER PART</a></h1><div class='tags floatleft'><a href='/parts/6490255/mini-lower-part'>6490255</a> <a href='/parts/design-77601'>77601</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Minifigure-Parts'>Minifigure Parts</a> <a href='/parts/colour-White'>White</a> <a href='/parts/year-2024'>2024</a></div><div class='floatright'>©2024 LEGO Group</div>

MINI LOWER PART

6490255 77601 System Minifigure Parts White 2024
©2024 LEGO Group
« Previous Next »
1 White Minifigure Parts 77601 MINI LOWER PART 3 2024 33 2021
6507816 <h1><a href='/parts/6507816/design-element-2x2x2-3-no-1'>DESIGN ELEMENT 2X2X2/3, NO. 1</a></h1><div class='tags floatleft'><a href='/parts/6507816/design-element-2x2x2-3-no-1'>6507816</a> <a href='/parts/design-1762'>1762</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Miscellaneous'>Miscellaneous</a> <a href='/parts/colour-White'>White</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

DESIGN ELEMENT 2X2X2/3, NO. 1

6507816 1762 System Miscellaneous White 2025
©2025 LEGO Group
« Previous Next »
1 White Miscellaneous 1762 DESIGN ELEMENT 2X2X2/3, NO. 1 2 2025 28 2022
6527759 <h1><a href='/parts/6527759/flat-tile-1x1-no-334'>FLAT TILE 1X1, NO. 334</a></h1><div class='tags floatleft'><a href='/parts/6527759/flat-tile-1x1-no-334'>6527759</a> <a href='/parts/design-111400'>111400</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Plates'>Plates</a> <a href='/parts/colour-White-Glow'>White Glow</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

FLAT TILE 1X1, NO. 334

6527759 111400 System Plates White Glow 2025
©2025 LEGO Group
« Previous Next »
1 White Glow Plates 111400 FLAT TILE 1X1, NO. 334 2 2025 2 2025