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
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
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1 Black Minifigure Parts 76382 MINI UPPER PART, NO. 7575 1 2025 10584 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
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6 Brick Yellow Bricks 6806 BRICK 2X6X1, INV. ARCH 1 2025 21 2025
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 21 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
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5 Bright Bluish Green Connectors 59443 CROSS AXLE, EXTENSION, 2M 1 2025 2019 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
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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 28 2025
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
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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
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
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1 Reddish Brown Minifigure Parts 76382 MINI UPPER PART, NO. 7574 1 2025 10584 1993
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 2019 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 10584 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
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1 Sand Yellow Minifigure Parts 5958 MINI WIG NO. 13 3 2025 12 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
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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
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2 Transparent Animals & Nature 3565 LEAF 2X6X1, NO. 1 3 2025 72 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
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1 Umber Brown Minifigure Parts 111394 MINI HEAD, NO. 4570 1 2025 1 2025
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
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1 White Minifigure Parts 77601 MINI LOWER PART 3 2024 41 2021
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
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1 White Glow Plates 111400 FLAT TILE 1X1, NO. 334 2 2025 2 2025