Unique 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
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 1 2025 1 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 310 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