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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.

Checking

70403 Dragon Mountain

355 pieces in 159 part and color combinations, plus 5 minifigures.

The piece count includes the 26 parts inside the set's minifigures, which this inventory lists separately. Spare parts are counted in neither figure.

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.

Every bag and the box. Shake out each bag, check its corners and seams, and look inside the empty box.
Inside what you have built. Small pieces lodge inside tubes, under plates and between studs. Turn the model over and look.
The last few steps. Compare each recent step with its parts callout. A piece used in the wrong place earlier leaves you one short later.
Look-alike colors. 2 parts in this set come in two colors that are easy to mix up; they are listed below.
The spare pieces. This set comes with 22 spare pieces, marked on each row of the checklist. One may be the piece you need.
The floor and your building area. Check under furniture, the chair and the edges of your building surface.

Look-alike colors in this set

These parts appear in this set in two colors that are easy to confuse. If you are one short in one color, check whether it went in where the other color belongs. Each color has its own element ID in the parts list at the back of the instructions.

Brick Round 1 x 1 Open Stud Red ×6 Trans-Red ×1 Trans-Red is see-through: hold the piece up to a light.
Brick Arch 1 x 6 Raised Arch Black ×2 Dark Bluish Gray ×1 Black is darker than Dark Bluish Gray.

Piece checklist

Bricks Special 27 pieces

Brick Special 1 x 1 with Clip Vertical [Open O Clip, Hollow Stud] Dark Bluish Gray Part 60475b Element 6321350 or 4580437 ×2
Brick Special 1 x 1 with Headlight Dark Bluish Gray Part 4070 Element 4211044 ×8
Brick Special 1 x 2 with 2 Pins, Round Pin Holes Dark Bluish Gray Part 30526 Element 4210697 ×2
Brick Special 1 x 2 with Vertical Clip [Thick U Clip] Dark Bluish Gray Part 30237a ×1
Brick Special 1 x 2 with Masonry Brick Profile Dark Tan Part 98283 Element 4646577 ×5
Brick Special 1 x 2 with 2 Studs on 1 Side Light Bluish Gray Part 11211 Element 6015344 ×2
Brick Special 1 x 2 Palisade [aka Log] Reddish Brown Part 30136 Element 4211180 ×4
Brick Special 1 x 4 Palisade [aka Log] Reddish Brown Part 30137 Element 4211181 ×3

Bricks 17 pieces

Brick 1 x 1 Black Part 3005 Element 300526 ×2
Brick 1 x 4 Black Part 3010 Element 301026 ×3
Brick 2 x 2 Dark Bluish Gray Part 3003 Element 4211060 ×1
Brick 2 x 6 Dark Bluish Gray Part 2456 Element 4282819 or 4210875 ×5
Brick 1 x 3 Light Bluish Gray Part 3622 Element 4211428 ×3
Brick 2 x 4 Light Bluish Gray Part 3001 Element 4211385 ×1
Brick 1 x 2 Red Part 3004 Element 4613961 or 300421 ×2

Technic Bricks 16 pieces

Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Black Part 32064a Element 6178922 or 4233487 ×5
Technic Slope Short (Wing Front) Dark Bluish Gray Part 2743 Element 4273814 ×4
Technic Brick 1 x 2 [2 Pin Holes] Light Bluish Gray Part 32000 Element 4211541 ×2
Technic Brick 1 x 2 with Axle Hole Type 1 [+ Opening] and Bottom Pin Light Bluish Gray Part 32064a Element 6206249 or 4233493 ×2
Technic Brick 1 x 2 [1 Pin Hole] Reddish Brown Part 3700 Element 4211252 ×3

Plates Special 14 pieces

Plate Special 8 x 8 with Grille [Hole in Center] Dark Bluish Gray Part 4151b Element 6471953 or 4299022 ×1
Plate Special 10 x 10 Octagonal with Hole Dark Tan Part 89523 Element 6288246 or 4584485 ×1
Plate Special 2 x 2 with Groove and Center Stud (Jumper) Dark Tan Part 87580 Element 6126075 or 4578032 ×4
Plate Special 2 x 2 with Pin on Bottom Dark Tan Part 2476a Element 6606096 or 6276849 ×1
Plate Special 10 x 10 Octagonal with Hole Green Part 89523 Element 4583684 ×1
Plate Special 1 x 2 with Bar Up [Horizontal Arm 5mm] Light Bluish Gray Part 88072 Element 6261353 or 4611702 ×1
Plate Special 1 x 2 with Clip Horizontal on Side Light Bluish Gray Part 11476 Element 6313114 or 6028812 ×1
Plate Special 1 x 2, Top Clip [Split] Light Bluish Gray Part 92280 Element 4598526 ×2
Plate Special 1 x 1 with Clip Vertical [Thick U Clip] Red Part 4085c Element 408521 ×2

Bricks Curved 12 pieces

Brick Arch 1 x 4 Black Part 3659 Element 365926 ×5
Brick Arch 1 x 6 Raised Arch Black Part 92950 Element 4620763 Also in Dark Bluish Gray ×2
Brick Arch 1 x 6 Raised Arch Dark Bluish Gray Part 92950 Element 4620760 Also in Black ×1
Brick Arch 1 x 8 x 2 Dark Bluish Gray Part 3308 Element 4541748 or 4220973 ×3
Brick Arch 1 x 3 Light Bluish Gray Part 4490 Element 4645397 or 4519971 ×1

Technic Pins 12 pieces

Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×1
Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Light Bluish Gray Part 32054 Element 4211865 ×2
Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 2 spares in the box ×5
Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×4

Bars, Ladders and Fences 11 pieces

Antenna 1 x 4 with Flat Top Black Part 3957b Element 395726 ×1
Bar, 4 Top Bars, Palm Tree Top Black Part 2566 Element 4532220 or 4159103 ×1
Stairs Spiral Step Dark Bluish Gray Part 40243 Element 4153418 ×5
Stairs Spiral Step Dark Tan Part 40243 Element 6154370 or 6028024 ×3
Bar 1L with Top Stud and Two Side Studs Pearl Gold Part 92690 Element 6328909 or 4640843 ×1

Minifig Shields, Weapons, & Tools 11 pieces

Weapon Lance Black Part 3849 Element 6345264 or 384926 ×2
Weapon Lance Flat Silver Part 3849 Element 4611884 ×1
Weapon Pike / Spear Flat End Flat Silver Part 93789 Element 4611883 ×1
Weapon Sword / Shortsword Elaborate Hilt Flat Silver Part 76764 Element 6020190 1 spare in the box ×1
Shield Ovoid with Lion Head on White and Blue Print Light Bluish Gray Part 2586pr0009 Element 6039740 ×1
Shield Ovoid with Red Dragon Head and Fire on Black Background Print Light Bluish Gray Part 2586pr0008 Element 6039739 ×1
Shield Triangular with Red Dragon Head on Black Background Print Light Bluish Gray Part 3846pr0012 Element 6039769 ×1
Weapon Pike / Spear Flat End Pearl Gold Part 93789 Element 4612889 ×2
Weapon Sword / Greatsword Pointed with Thin Crossguard Pearl Titanium Part 98370 Element 6000177 ×1

Plates Round Curved and Dishes 11 pieces

Dish 2 x 2 Inverted [Radar] Black Part 4740 Element 474026 ×1
Plate Round 2 x 2 with Axle Hole Type 1 (+ Opening) Blue Part 4032a Element 403223 ×4
Dish 3 x 3 Inverted [Radar] Dark Bluish Gray Part 43898 Element 4210865 ×1
Plate Round Corner 4 x 4 Green Part 30565 Element 6038682 or 4522245 ×1
Plate Round Corner 3 x 3 Reddish Brown Part 30357 Element 4283660 ×2
Plate Round 1 x 1 with Solid Stud Tan Part 6141 Element 4161734 or 614105 1 spare in the box ×1
Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×1

Bricks Wedged 8 pieces

Brick Wedged 2 x 2 Facet Black Part 87620 Element 4584274 ×6
Brick Wedged 4 x 4 Facet Black Part 14413 Element 6039347 ×2

Hinges, Arms and Turntables 8 pieces

Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 Teeth Black Part 30553 Element 4143372 ×4
Hinge Plate 1 x 2 Locking with 1 Finger On Top Dark Bluish Gray Part 30383 Element 6265693 or 4210726 ×4

Minifig Accessories 8 pieces

Money / Coin with "1" Gothic Type Chrome Gold Part 96904 ×1
Money / Coin with "10" Gothic Type Chrome Gold Part 96907 ×1
Money / Coin with "2" Gothic Type Chrome Gold Part 96905 ×1
Money / Coin with "5" Gothic Type Chrome Gold Part 96906 ×1
Equipment Key Dark Bluish Gray Part 62808 ×2
Equipment Telescope / Torch / Spyglass, Support Round 1 x 1 x 1 2/3 Dark Brown Part 64644 Element 4538950 ×1
Equipment Goblet / Glass Light Bluish Gray Part 2343 Element 4261919 ×1

Plants & Trees 7 pieces

Plant, Carrot Top Bright Green Part 33183 Element 4119479 1 spare in the box ×1
Plant / Creature Body Part, Vine / Tail / Tentacle / Bionicle Spine, Spiky Dark Green Part 55236 Element 6369999 or 4294148 ×3
Plant, Leaves 6 x 5 Dark Green Part 2417 Element 6266967 or 4505066 ×1
Plant, Round 1 x 1 - 3 Bamboo Leaves Green Part 30176 Element 6270003 or 6248461 ×2

Tiles 6 pieces

Tile 1 x 2 with Groove Dark Tan Part 3069b Element 4496699 ×4
Tile 1 x 4 with Groove Light Bluish Gray Part 2431 Element 4211356 or 2431194 ×2

Windows and Doors 6 pieces

Door Frame 1 x 4 x 6 Type 2 Black Part 60596 Element 6337273 or 4535834 ×1
Window 1 x 2 x 2 & 2/3 Pane Twisted Bar with Rounded Top Black Part 30045 Element 4105221 ×2
Door 1 x 4 x 6 Barred with Stud Handle Pearl Titanium Part 60621 Element 6037634 ×1
Window 1 x 2 x 2 2/3 with Rounded Top Reddish Brown Part 30044 Element 4542131 or 4224625 ×2

Tiles Round and Curved 5 pieces

Tile Round 1 x 1 Blue Part 98138 Element 6284575 or 6009460 1 spare in the box ×2
Tile Round 1 x 1 Flat Silver Part 98138 Element 6238890 or 4655241 1 spare in the box ×2
Tile Round 1 x 1 with Padlock Print Pearl Gold Part 98138pr0014 Element 6287846 or 6039771 1 spare in the box ×1

Energy Effects 4 pieces

Flame / Headwear Accessory Plume / Feather, Triple Point Trans-Neon Orange Part 64647 Element 6289248 or 6100033 2 spares in the box ×2
Wave / Flame Rounded with Base Rim Trans-Neon Orange Part 6126b Element 6258495 or 6167743 ×1
Wave / Flame Rounded Large with Marbled Trans-Yellow Pattern Trans-Red Part 85959pat0003 Element 6513987 or 6172283 ×1

Flags, Banners and Signs 4 pieces

Flag 4 x 1 Wavy [First Wave Right] Blue Part 4495b Element 6268955 or 6215573 ×1
Flag 4 x 1 Wavy [First Wave Right] Pearl Gold Part 4495b Element 6268949 or 4504649 ×1
Flag 4 x 1 Wavy [First Wave Right] Red Part 4495b Element 6268946 or 449521 ×2

Panels 4 pieces

Panel 1 x 2 x 3 [Side Supports / Hollow Studs] Black Part 87544 Element 4614788 or 4585452 ×2
Panel 1 x 4 x 5 with Arched Window Dark Bluish Gray Part 60808 Element 4537057 ×2

Rock 3 pieces

Rock Panel 2 x 4 x 6 Dark Bluish Gray Part 47847 Element 4513326 ×2
Rock 1 x 1 Crystal 5 Point Trans-Red Part 30385 Element 6507863 or 6236961 ×1

Technic Connectors 3 pieces

Technic Pin Connector Plate 1 x 2 x 1 2/3 [Two Holes On Top] Black Part 32530 Element 4144024 ×1
Technic Axle Connector Hub with 4 Bars at 90° Dark Bluish Gray Part 48723 Element 4222192 ×2

Animals / Creatures 2 pieces

Insect, Spider Black Part 30238 Element 4113209 ×1
Animal, Rodent, Rat / Mouse [Plain] Light Bluish Gray Part 40234 Element 4512743 or 4225169 ×1

Containers 2 pieces

Treasure Chest Bottom with Rear Slots, with Groove Reddish Brown Part 4738b Element 4280114 or 4211162 ×1
Treasure Chest Lid [Thick Hinge] Reddish Brown Part 4739a Element 6254220 or 6167676 ×1

Plates Wedged 2 pieces

Wedge Plate 4 x 6 Cut Corners Dark Bluish Gray Part 32059 Element 4521572 or 4210652 ×2

Projectiles / Launchers 2 pieces

Launcher, 1 x 4 with 1 x 2 Plate with Pin Hole and Bucket (Catapult) Dark Brown Part 88289 Element 4568951 ×1
Launcher, with 1 x 8 Plate with Pin Hole and Bucket (Catapult) Reddish Brown Part 30275 Element 6037499 or 4267033 ×1

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

Tiles Special 2 pieces

Tile Special 1 x 2 with Sloped Walls AKA Money / Gold Bar [Ingot] Chrome Gold Part 99563 ×1
Tile Special 2 x 2 with Top Pin Dark Bluish Gray Part 2460 Element 4211129 ×1

Animal / Creature Accessories 1 piece

Insect Accessory, Spider Web, Hanging White Part 90981 Element 6549520 or 6006221 ×1

Minifig Lower Body 1 piece

Leg Skeleton White Part 6266 Element 6240495 or 6038450 1 spare in the box ×1

Supports, Girders and Cranes 1 piece

Support 1 x 1 x 5 1/3 Spiral Staircase Axle Tan Part 40244 Element 4288363 or 4153421 ×1

Technic Axles 1 piece

Technic Axle 4 Black Part 3705 Element 370526 ×1

Tools 1 piece

Brick and Axle Separator v2.0 Orange Part 96874 Element 6240515 or 4654448 ×1

Tubes and Hoses 1 piece

Hose Rigid 3mm D. 3L / 2.4cm Reddish Brown Part 75c03 Element 6030330 1 spare in the box ×1

Minifigures 5 figures

Maiden (Blue Lion) - Dark Red Hair Minifigure, checked as a whole figure ×1
Wizard (Red Dragon) Minifigure, checked as a whole figure ×1
Knight, Blue, Armor, Helmet with Visor and Blue Plume Minifigure, checked as a whole figure ×1
Knight, Blue, Helmet Minifigure, checked as a whole figure ×1
Dragon Knight, Red, Helmet, Soul-patch Minifigure, checked as a whole figure ×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.