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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.

Sonic Phantom

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7704 Sonic Phantom

208 pieces in 77 part and color combinations, plus 1 minifigure.

LEGO counts 215 pieces. This inventory comes from a separate parts catalog and lists 216, including the 8 parts inside the minifigures; the two do not always count the same elements, so their totals differ. 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.

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.

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Piece checklist

Black 79 pieces

  • Antenna 8H Whip Black Part 2569 Element 6265148 or 6164379 ×1
  • Brick Curved 6 x 2 Black Part 44126 Element 4180548 ×2
  • Brick Sloped 45° 2 x 2 Black Part 3039 Element 303926 ×2
  • Brick Special 1 x 2 with Handle Black Part 30236 Element 4288212 or 4113243 ×1
  • Brick Wedged, Curved 8 x 3 x 2 Open Left Black Part 41750 Element 6271277 or 6185621 ×2
  • Brick Wedged, Curved 8 x 3 x 2 Open Right Black Part 41749 Element 6271278 or 6185619 ×2
  • Cone 4 x 4 x 2, Axle Hole [Plain] Black Part 3943b Element 4143243 or 394326 ×2
  • Engine, Very Large Turbine, with Pearl Light Gray Marbled Pattern Black Part 53983pat0001 Element 4289157 or 4283929 ×4
  • Hinge Brick 1 x 2 Locking with 2 Fingers Vertical End, 9 Teeth Black Part 30365 Element 4144502 or 4129975 ×4
  • Hinge Cylinder 1 x 2 Locking with 2 Click Fingers and Axle Hole, 9 Teeth Black Part 30553 Element 4143372 ×1
  • Hinge Cylinder 1 x 3 Locking with 1 Finger and Technic Friction Pin with Round Hole Black Part 41532 Element 4159335 ×4
  • Launcher, Technic Competition Cannon, Round Bottom with Same Color Ends Black Part 32074c01 Element 4118816 or 4118815 ×1
  • Plate 1 x 8 Black Part 3460 Element 346026 ×2
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Black Part 6019 Element 601976 or 601926 ×2
  • Plate Special 3 x 2 with Rounded End, Hole Black Part 3176 Element 317676 or 317626 Also in Dark Bluish Gray ×2
  • Support 1 x 1 x 5 1/3 Spiral Staircase Axle Black Part 40244 Element 4155558 ×4
  • Technic Axle 4 Black Part 3705 Element 370526 ×2
  • Technic Axle 6 Black Part 3706 Element 370626 ×7
  • Technic Beam 1 x 4 Thin with Stud Connector Black Part 2825 Element 6331570 or 4107136 ×4
  • Technic Beam 1 x 7 Thick Black Part 32524 Element 4495935 or 4155458 ×2
  • Technic Brick 1 x 14 [13 Pin Holes] Black Part 32018 Element 4107558 ×4
  • Technic Cylinder 4 x 4 with Pin Holes and Centre Bar, Closed Sides on Bar Black Part 41531 Element 6116995 or 4262615 ×1
  • Technic Pin Long with Friction Ridges Lengthwise, 2 Center Slots Black Part 6558 Element 655826 ×5
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 1 spare in the box ×10
  • Technic Plate 2 x 4 [3 Holes] Black Part 3709 Element 370926 Also in Dark Bluish Gray ×4
  • Tile Special 1 x 2 with Handle Black Part 2432 Element 243226 ×1
  • Wedge Plate 3 x 6 Cut Corners Black Part 2419 Element 241926 ×1
  • Wedge Plate 8 x 3, 22° Left Black Part 50305 Element 4251394 ×1
  • Wedge Plate 8 x 3, 22° Right Black Part 50304 Element 4251393 ×1

Dark Bluish Gray 43 pieces

  • Brick 2 x 2 Dark Bluish Gray Part 3003 Element 4211060 ×1
  • Brick 2 x 4 Dark Bluish Gray Part 3001 Element 4211085 ×1
  • Brick 2 x 6 Dark Bluish Gray Part 2456 Element 4282819 or 4210875 ×3
  • Brick Curved 6 x 1 Dark Bluish Gray Part 42022 Element 6058858 or 4210778 ×3
  • Brick Sloped 18° 4 x 2 Dark Bluish Gray Part 30363 Element 4210637 ×1
  • Brick Sloped 45° 2 x 1 with Bottom Pin Dark Bluish Gray Part 3040b Element 4211135 ×1
  • Brick Sloped Inverted 45° 2 x 1 Dark Bluish Gray Part 3665 Element 4211096 ×1
  • Brick Sloped Inverted 45° 2 x 2 [Ovoid Bottom Pin, Bar-sized Stud Holes] Dark Bluish Gray Part 3660 Element 4211000 ×2
  • Equipment Weapon, Loudhailer / Speaker / Blaster / Space Gun Dark Bluish Gray Part 4349 Element 4210698 ×2
  • Hinge Tile 1 x 3 Locking with 1 Finger on Top Dark Bluish Gray Part 44300 Element 4210882 ×1
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Dark Bluish Gray Part 3794a ×3
  • Plate Special 3 x 2 with Rounded End, Hole Dark Bluish Gray Part 3176 Element 4225733 Also in Black ×2
  • Technic Axle 3 with Stud Dark Bluish Gray Part 6587 Element 6587199 or 6129590 ×1
  • Technic Beam 1 x 11.5 Double Bent Thick Dark Bluish Gray Part 32009 Element 6271155 or 4210668 ×4
  • Technic Beam 3 x 5 L-Shape Thick Dark Bluish Gray Part 32526 Element 4210753 ×1
  • Technic Brick 1 x 2 [1 Pin Hole] Dark Bluish Gray Part 3700 Element 4211111 ×6
  • Technic Plate 2 x 4 [3 Holes] Dark Bluish Gray Part 3709 Element 4227398 Also in Black ×6
  • Tile 1 x 4 with Groove Dark Bluish Gray Part 2431 Element 4211053 ×2
  • Tile 2 x 2 with Groove Dark Bluish Gray Part 3068b Element 4211055 ×2

Light Bluish Gray 37 pieces

  • Brick Special 1 x 2 with Pin Light Bluish Gray Part 2458 Element 4211364 ×4
  • Engine / Air Scoop 2 x 2 Light Bluish Gray Part 50943 Element 4259422 ×3
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Light Bluish Gray Part 2444 Element 4211359 or 2444194 ×2
  • Plate Special 2 x 2 with Pin on Bottom Light Bluish Gray Part 2476a Element 6276848 or 4237084 ×4
  • Projectile, Technic Competition Arrow, Beam Shaft with Solid Lime Rubber End Light Bluish Gray Part 76110c05 Element 4504410 or 4281254 ×1
  • Technic Axle Connector with Axle Hole Light Bluish Gray Part 32039 Element 4211553 ×2
  • Technic Axle and Pin Connector Perpendicular Light Bluish Gray Part 6536 Element 6261375 or 4211775 ×1
  • Technic Beam 1 x 3 Thin Light Bluish Gray Part 6632 Element 6360043 or 4211566 ×2
  • Technic Bush Light Bluish Gray Part 3713 Element 6275844 or 6271817 1 spare in the box ×5
  • Technic Bush 1/2 Smooth with Axle Hole Semi-Reduced Light Bluish Gray Part 32123b Element 6271165 or 4211573 1 spare in the box ×4
  • Technic Pin 1/2 without Friction Ridges Light Bluish Gray Part 4274 Element 4274194 or 4211483 1 spare in the box ×1
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×8

Lime 12 pieces

  • Brick Round 2 x 2 Dome Top, Blocked Open Stud, Bottom Axle Holder Lime Part 30367b ×2
  • Technic Axle Connector Ridged [with x Hole x Orientation] Lime Part 6538b Element 4265703 or 4154499 ×5
  • Technic Ball Joint Lime Part 32474 Element 4624381 or 4290718 ×1
  • Technic Beam 1 x 4 Thin Lime Part 32449 Element 6370403 or 4263131 ×4

Blue 9 pieces

  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×9

Trans-Red 8 pieces

  • Bar 4L (Lightsaber Blade / Wand) Trans-Red Part 30374 Element 6507880 or 6167284 ×1
  • Cone 1 x 1 [No Top Groove] Trans-Red Part 4589 Element 618841 ×3
  • Plate Round 1 x 1 with Solid Stud Trans-Red Part 6141 Element 6514051 or 6208450 1 spare in the box ×4

Tan 6 pieces

  • Plate 2 x 3 Tan Part 3021 Element 4118790 or 302105 ×2
  • Technic Axle Pin without Friction Ridges Lengthwise Tan Part 3749 Element 4666579 or 4186017 ×4

Pearl Light Gray 4 pieces

  • Hose, Ribbed 7mm D. 9L / 7.2cm Pearl Light Gray Part 78c09 Element 4495206 or 4141671 ×4

Red 4 pieces

  • Technic Axle 2 Notched Red Part 32062 Element 4142865 1 spare in the box ×4

Yellow 2 pieces

  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] Yellow Part 32064b ×2

Trans-Brown 1 piece

  • Brick Curved 2 x 2 with Lip, No Studs Trans-Brown Part 30602 Element 6507872 or 6171717 ×1

Trans-Clear 1 piece

  • Light Brick 2 x 4 [Red LED] Trans-Clear Part 54605 Element 4283931 ×1

White 1 piece

  • Rubber Belt Small [15mm ID] [Round Cross Section] White Part 85543 Element 6699001 or 4580665 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 7704-1 [No Color/Any Color] Part 54941 Element 4286990 ×1

Minifigures 1 figure

  • Devastator with Trans-Neon Green Torso and Red Eyes 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.

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