Free tool

LEGO Missing Piece Checker

Rule out the usual hiding places first. If the piece really is gone, check the set piece by piece and leave with the element ID LEGO asks for, or a link to buy the part.

Seattle Space Needle

Checking

21003 Seattle Space Needle

57 pieces in 23 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

Technic Connectors 14 pieces

  • Technic Axle Connector Hub with 3 Axles at 120° Light Bluish Gray Part 57585 Element 4502595 ×2
  • Technic Axle Connector Smooth [with x Hole + Orientation] Light Bluish Gray Part 59443 Element 4512360 ×6
  • Technic Axle and Pin Connector Angled #1 Light Bluish Gray Part 32013 Element 6296859 or 4211550 ×6

Tiles 12 pieces

  • Tile 1 x 8 with 'Seattle Space Needle' Print Black Part 4162pr0010 Element 4546194 ×1
  • Tile 1 x 8 with Groove Black Part 4162 Element 416226 ×3
  • Tile 1 x 6 with Groove Light Bluish Gray Part 6636 Element 4211549 ×4
  • Tile 2 x 2 with Groove Light Bluish Gray Part 3068b Element 4211413 ×4

Plates Round Curved and Dishes 10 pieces

  • Dish 2 x 2 Inverted [Radar] Light Bluish Gray Part 4740 Element 4211512 ×1
  • Dish 4 x 4 Inverted [Radar] Light Bluish Gray Part 3960 Element 4211664 ×1
  • Dish 6 x 6 Inverted (Radar) with Solid Studs Light Bluish Gray Part 44375b Element 4211796 ×3
  • Plate Round 1 x 1 with Solid Stud Light Bluish Gray Part 6141 Element 4211525 1 spare in the box ×1
  • Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Light Bluish Gray Part 4032a Element 4211475 ×4

Technic Axles 7 pieces

  • Technic Axle 3 Light Bluish Gray Part 4519 Element 4211815 ×1
  • Technic Axle 5 Light Bluish Gray Part 32073 Element 32073194 or 4211639 ×2
  • Technic Axle 2 Notched Red Part 32062 Element 4142865 ×4

Plates 4 pieces

  • Plate 4 x 10 Black Part 3030 Element 303076 or 303026 ×2
  • Plate 4 x 6 Light Bluish Gray Part 3032 Element 4211404 ×2

Technic Gears 3 pieces

  • Technic Gear 20 Tooth Bevel Light Bluish Gray Part 32198 Element 6359714 or 6031956 ×2
  • Technic Gear 40 Tooth Light Bluish Gray Part 3649 Element 6195314 or 4285634 ×1

Tubes and Hoses 3 pieces

  • Hose Rigid 3mm D. 20L / 16cm Light Bluish Gray Part 75c20 Element 6191556 or 4514198 1 spare in the box ×3

Technic Bushes 2 pieces

  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×2

Bars, Ladders and Fences 1 piece

  • Antenna 1 x 4 with Rounded Top Light Bluish Gray Part 3957a ×1

Wheels and Tyres 1 piece

  • Technic Wedge Belt Wheel [aka Pulley] Light Bluish Gray Part 4185 Element 6321743 or 4494222 ×1

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.