Rare parts in 42666-1: Cat Birthday Party

This set inventory has been obtained from LEGO Customer Services replacement parts page. It was retrieved on 3 October 2025 and contains 320 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
6522798 <h1><a href='/parts/6522798/leaf-4x5x1-2-3'>LEAF 4X5X1 2/3</a></h1><div class='tags floatleft'><a href='/parts/6522798/leaf-4x5x1-2-3'>6522798</a> <a href='/parts/design-5058'>5058</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Animals-Nature'>Animals & Nature</a> <a href='/parts/colour-Bright-Yellowish-Green'>Bright Yellowish Green</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

LEAF 4X5X1 2/3

6522798 5058 System Animals & Nature Bright Yellowish Green 2025
©2025 LEGO Group
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3 Bright Yellowish Green Animals & Nature 5058 LEAF 4X5X1 2/3 2 2025 51 2024
6542233 <h1><a href='/parts/6542233/cat-no-55'>CAT, NO. 55</a></h1><div class='tags floatleft'><a href='/parts/6542233/cat-no-55'>6542233</a> <a href='/parts/design-113035'>113035</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Animals-Nature'>Animals & Nature</a> <a href='/parts/colour-Dark-Stone-Grey'>Dark Stone Grey</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

CAT, NO. 55

6542233 113035 System Animals & Nature Dark Stone Grey 2025
©2025 LEGO Group
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1 Dark Stone Grey Animals & Nature 113035 CAT, NO. 55 2 2025 2 2025
6526012 <h1><a href='/parts/6526012/plate-4x4-w-arch'>PLATE 4X4, W/ ARCH</a></h1><div class='tags floatleft'><a href='/parts/6526012/plate-4x4-w-arch'>6526012</a> <a href='/parts/design-35044'>35044</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Plates'>Plates</a> <a href='/parts/colour-Light-Purple'>Light Purple</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

PLATE 4X4, W/ ARCH

6526012 35044 System Plates Light Purple 2025
©2025 LEGO Group
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1 Light Purple Plates 35044 PLATE 4X4, W/ ARCH 3 2025 263 2018
6542234 <h1><a href='/parts/6542234/cat-w-1-5-hole-no-37'>CAT, W/ 1.5 HOLE, NO. 37</a></h1><div class='tags floatleft'><a href='/parts/6542234/cat-w-1-5-hole-no-37'>6542234</a> <a href='/parts/design-113036'>113036</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Animals-Nature'>Animals & Nature</a> <a href='/parts/colour-Nougat'>Nougat</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

CAT, W/ 1.5 HOLE, NO. 37

6542234 113036 System Animals & Nature Nougat 2025
©2025 LEGO Group
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1 Nougat Animals & Nature 113036 CAT, W/ 1.5 HOLE, NO. 37 3 2025 3 2025
6541654 <h1><a href='/parts/6541654/brick-1x2-outside-half-arch-no-1'>BRICK 1X2, OUTSIDE HALF ARCH, NO. 1</a></h1><div class='tags floatleft'><a href='/parts/6541654/brick-1x2-outside-half-arch-no-1'>6541654</a> <a href='/parts/design-78666'>78666</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Bricks'>Bricks</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>

BRICK 1X2, OUTSIDE HALF ARCH, NO. 1

6541654 78666 System Bricks Vibrant Coral 2025
©2025 LEGO Group
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2 Vibrant Coral Bricks 78666 BRICK 1X2, OUTSIDE HALF ARCH, NO. 1 1 2025 398 2021
6520273 <h1><a href='/parts/6520273/cat-no-51'>CAT, NO. 51</a></h1><div class='tags floatleft'><a href='/parts/6520273/cat-no-51'>6520273</a> <a href='/parts/design-110359'>110359</a> <a href='/parts/platform-System'>System</a> <a href='/parts/category-Animals-Nature'>Animals & Nature</a> <a href='/parts/colour-White'>White</a> <a href='/parts/year-2025'>2025</a></div><div class='floatright'>©2025 LEGO Group</div>

CAT, NO. 51

6520273 110359 System Animals & Nature White 2025
©2025 LEGO Group
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1 White Animals & Nature 110359 CAT, NO. 51 1 2025 1 2025