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LEGO Missing Piece Checker

Enter a set number, mark each piece found or missing, and leave with a list of what is missing, the element IDs LEGO asks for and links to buy the parts. It is free and needs no account. Rule out the usual hiding places first.

Extension Assortment for LEGO Composing Set 9550

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49901 Extension Assortment for LEGO Composing Set 9550

121 pieces in 42 part and color combinations.

Before you call it missing

Builders who report a missing piece often find it in one of these places. Tick each one off as you look.

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Piece checklist

White 121 pieces

  • Baseplate 18 x 26 White Part 2836 Element 283601 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End Plain White Part 2835 Element 283501 ×10
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'B' Print White Part 2835pr0013 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'C' Print White Part 2835pr0015 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'D' Print White Part 2835pr0017 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'G' Print White Part 2835pr0023 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'H' Print White Part 2835pr0025 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'K' Print White Part 2835pr0031 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'N' Print White Part 2835pr0037 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'P' Print White Part 2835pr0041 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'R' Print White Part 2835pr0045 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'S' Print White Part 2835pr0047 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'U' Print White Part 2835pr0051 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'V' Print White Part 2835pr0053 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'W' Print White Part 2835pr0055 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'Z' Print White Part 2835pr0061 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'a' Print White Part 2835pr0010 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'b' Print White Part 2835pr0012 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'c' Print White Part 2835pr0014 ×6
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'd' Print White Part 2835pr0016 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'e' Print White Part 2835pr0018 ×11
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'f' Print White Part 2835pr0020 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'g' Print White Part 2835pr0022 ×4
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'h' Print White Part 2835pr0024 ×7
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'i' Print White Part 2835pr0026 ×4
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'k' Print White Part 2835pr0030 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'n' Print White Part 2835pr0036 ×9
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'r' Print White Part 2835pr0044 ×6
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 's' Print White Part 2835pr0046 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 't' Print White Part 2835pr0048 ×8
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'u' Print White Part 2835pr0050 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'v' Print White Part 2835pr0052 ×1
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'w' Print White Part 2835pr0054 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'x' Print White Part 2835pr0056 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'Ä' Print White Part 2835pr0074 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'Ö' Print White Part 2835pr0084 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'Ü' Print White Part 2835pr0088 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'ß' Print White Part 2835pr0089 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'ä' Print White Part 2835pr0073 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'ö' Print White Part 2835pr0083 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with 'ü' Print White Part 2835pr0087 ×2
  • Tile Special 1 x 2 x 5/6 with Stud Hole in End with E' Print White Part 2835pr0019 ×4

Tick each piece as you find it, or mark it missing.

When a piece really is missing

Ask LEGO

LEGO takes requests for pieces missing from a new set through its customer service site. The form asks for the set number and each piece's element ID, the number printed beside the piece in the parts list at the back of the instructions. This checker lists both.

Request a replacement from LEGO

Buy the piece

Mark a piece missing and your list links it to an eBay search for that part, which also covers pieces from older or second-hand sets.

Keep a record

Copy or download your missing list (the CSV opens in any spreadsheet), or print the whole checklist and tick pieces off on paper. Your marks stay in this browser, so you can check a big set over several sittings.

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