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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.

MX-41 Switch Fighter

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7647 MX-41 Switch Fighter

228 pieces in 89 part and color combinations, plus 2 minifigures.

The official piece count includes the 7 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.

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Piece checklist

Black 65 pieces

  • Bar 1L with Clip Black Part 48729a Element 4272218 1 spare in the box ×4
  • Brick 2 x 6 Black Part 2456 Element 4181144 or 245626 ×1
  • Brick Curved 3 x 1 No Studs Black Part 50950 Element 4251161 ×4
  • Brick Special 1 x 1 with Headlight Black Part 4070 Element 407026 ×4
  • Brick Special 1 x 2 with Grille Black Part 2877 Element 287726 ×3
  • Brick Wedged, Curved 4 x 4 No Top Studs Black Part 47753 Element 4219107 ×2
  • Equipment Goblet / Glass Black Part 2343 Element 6247194 or 4223189 ×2
  • Fairing 1 x 4 Side Flaring Intake with Two Pins Black Part 30647 Element 4229602 or 4153013 ×2
  • Handlebars Black Part 30031 Element 3003126 ×1
  • Hinge Brick 1 x 2 Base Black Part 3937 Element 393726 ×3
  • Plate 1 x 12 Black Part 60479 Element 4514845 ×4
  • Plate 1 x 3 Black Part 3623 Element 362326 ×2
  • Plate 1 x 6 Black Part 3666 Element 366626 ×5
  • Plate 2 x 12 Black Part 2445 Element 244526 ×2
  • Plate 2 x 16 Black Part 4282 Element 428276 or 428226 ×2
  • Plate 2 x 8 Black Part 3034 Element 303426 ×2
  • Plate Round 1 x 1 with Solid Stud Black Part 6141 Element 614126 1 spare in the box ×2
  • Plate Special 1 x 2 [Side Handle Closed Ends] Black Part 48336 Element 4225201 ×4
  • Plate Special 1 x 2 with Handles [Flat Ends / Low Attachment] Black Part 3839b Element 383926 ×2
  • Technic Axle 4 Black Part 3705 Element 370526 ×1
  • Technic Axle and Pin Connector Perpendicular Black Part 6536 Element 6261371 or 4173668 ×2
  • Technic Brick 1 x 8 [7 Pin Holes] Black Part 3702 Element 370226 ×2
  • Technic Pin Long with Friction Ridges Lengthwise and Stop Bush [3 Lateral Holes, Big Pin Hole] Black Part 32054 Element 4140801 or 4107742 ×1
  • Technic Pin with Friction Ridges Lengthwise and Center Slots Black Part 2780 Element 4121715 or 278026 2 spares in the box ×4
  • Wedge Plate 6 x 3 Left Black Part 54384 Element 4283047 ×2
  • Wedge Plate 6 x 3 Right Black Part 54383 Element 4283046 ×2

White 40 pieces

  • Brick 1 x 4 White Part 3010 Element 6550135 or 301001 ×1
  • Brick Wedged, Curved 10 x 3 Left White Part 50955 Element 6552138 or 6015474 ×1
  • Brick Wedged, Curved 10 x 3 Right White Part 50956 Element 6552139 or 6015477 ×1
  • Brick Wedged, Curved 8 x 3 x 2 Open Left White Part 41750 Element 6312345 or 6038751 ×1
  • Brick Wedged, Curved 8 x 3 x 2 Open Right White Part 41749 Element 6312346 or 6038641 ×1
  • Equipment Martian Hypersled with Pin (Mars Mission) White Part 58843 Element 4501924 ×1
  • Flag 2 x 2 Trapezoid with Flat Area between Clips White Part 44676 Element 6023099 or 4507191 ×4
  • Hinge Plate 1 x 4 Swivel Top / Base - Solid Clip [Complete Assembly] White Part 73983 Element 6102776 or 4287153 ×6
  • Plate 2 x 6 White Part 3795 Element 6550146 or 379501 ×2
  • Plate Round 1 x 1 with Solid Stud White Part 6141 Element 6601919 or 614101 1 spare in the box ×1
  • Plate Special 1 x 8 with Door Rail White Part 4510 Element 6619290 or 4501853 ×2
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] White Part 2444 Element 244401 ×6
  • Technic Brick 1 x 2 with Axle Hole Type 2 [X Opening] White Part 32064b ×2
  • Tile 1 x 2 with Groove White Part 3069b Element 6548264 or 306901 ×1
  • Tile 1 x 4 with Groove White Part 2431 Element 6548255 or 243101 ×2
  • Tile 1 x 6 with Groove White Part 6636 Element 6548296 or 663601 ×2
  • Tile Special 1 x 1 with Clip and Straight Tips White Part 2555 Element 255501 ×3
  • Wedge Plate 12 x 3 Left White Part 47397 Element 6552123 or 4208987 ×1
  • Wedge Plate 12 x 3 Right White Part 47398 Element 6552124 or 4209005 ×1
  • Windscreen 10 x 4 x 2 Curved with Bubble Cutout and Single Hinge Finger White Part 47843 Element 4291062 ×1

Light Bluish Gray 24 pieces

  • Brick Special 1 x 2 with 2 Pins, Round Pin Holes Light Bluish Gray Part 30526 Element 4211660 ×2
  • Brick Special 1 x 4 with Groove Light Bluish Gray Part 2653 Element 4211613 ×4
  • Plate 2 x 4 Light Bluish Gray Part 3020 Element 4211395 ×6
  • Technic Axle Connector Smooth [with x Hole + Orientation] Light Bluish Gray Part 59443 Element 4512360 ×2
  • Technic Brick 1 x 4 [3 Pin Holes] Light Bluish Gray Part 3701 Element 4211441 ×2
  • Technic Pin 1/2 with 2L Bar Extension Light Bluish Gray Part 61184 Element 6347715 or 4520320 ×2
  • Technic Pin without Friction Ridges Lengthwise Light Bluish Gray Part 3673 Element 4211807 or 3673194 1 spare in the box ×6

Orange 23 pieces

  • Plate 1 x 4 Orange Part 3710 Element 4118782 ×5
  • Plate Special 1 x 2 Side Handle [Free Ends] Orange Part 2540 Element 4190164 or 4163269 ×7
  • Tile Special 1 x 2 Grille with Bottom Groove Orange Part 2412b Element 4125254 or 3933106 ×5
  • Wheel Hard Plastic Small (22mm D. x 24mm) Orange Part 6118 Element 4505861 ×6

Trans-Neon Green 16 pieces

  • Antenna 1 x 4 with Rounded Top Trans-Neon Green Part 3957a ×4
  • Brick Round 1 x 1 Open Stud Trans-Neon Green Part 3062b Element 6514237 or 6238675 ×4
  • Dish 2 x 2 Inverted [Radar] Trans-Neon Green Part 4740 Element 6245297 or 4112517 ×2
  • Rock 1 x 1 Jewel / Gem 24 Facet Trans-Neon Green Part 30153 Element 6247790 or 4114505 ×5
  • Tile Special 1 x 2 Grille with Bottom Groove Trans-Neon Green Part 2412b Element 4272661 or 4109766 ×1

Red 14 pieces

  • Animal Body Part, Barb / Claw / Tooth / Talon / Horn, Small Red Part 53451 Element 6270107 or 4568388 1 spare in the box ×2
  • Brick 2 x 4 Red Part 3001 Element 300121 ×1
  • Hinge Brick 2 x 2 Top Plate Thin Red Part 6134 Element 613421 ×3
  • Plate Round 2 x 2 with Rounded Bottom [Boat Stud] Red Part 2654 Element 4617080 or 4278275 ×2
  • Plate Special 1 x 1 with Clip Horizontal [Thick U Clip] Red Part 6019 Element 601971 or 601921 ×5
  • Plate Special 2 x 2 with 1 Pin Hole [Split Underside Ribs] Red Part 2444 Element 244421 ×1

Trans-Orange 10 pieces

  • Brick Sloped 30° 1 x 1 x 2/3 (Cheese Slope) Trans-Orange Part 54200 Element 6245265 or 4244369 ×8
  • Cylinder 9 x 4 x 2 Tapered with Flat Bottom, Pin Holes Trans-Orange Part 58947 Element 4502233 ×1
  • Windscreen 9 x 3 x 1 2/3 Bubble Canopy Trans-Orange Part 47844 Element 4506847 ×1

Dark Bluish Gray 9 pieces

  • Brick 2 x 2 Dark Bluish Gray Part 3003 Element 4211060 ×1
  • Brick Round 1 x 1 with Fins, Open Stud Dark Bluish Gray Part 4588 Element 6331222 or 6321195 ×2
  • Equipment Space Binoculars / Scanner / Electrobinoculars Dark Bluish Gray Part 30304 Element 6359935 or 4211124 ×1
  • Plate 2 x 3 Dark Bluish Gray Part 3021 Element 4211043 ×2
  • Plate Special 1 x 2 with 1 Stud without Groove (Jumper) Dark Bluish Gray Part 3794a ×2
  • Tool Chainsaw Blade Dark Bluish Gray Part 6117 Element 6166069 or 4211048 ×1

Lime 8 pieces

  • Animal Body Part / Plant, Tail / Neck / Branch / Trunk, Middle Section with Pin, Round Pin Hole Lime Part 40378 Element 6290985 or 4650634 ×2
  • Plate 1 x 2 Lime Part 3023 Element 4164037 or 4122439 ×6

Blue 7 pieces

  • Brick Curved 2 x 2 x 2/3 Two Studs and Curved Slope End Blue Part 47457 Element 4496366 ×1
  • Technic Axle Pin with Friction Ridges Lengthwise Blue Part 43093 Element 4309323 or 4206482 ×2
  • Technic Pin 1/2 without Friction Ridges Blue Part 4274 Element 4143005 1 spare in the box ×4

Trans-Dark Blue 4 pieces

  • Cone 1 x 1 [No Top Groove] Trans-Dark Blue Part 4589 Element 618843 ×4

Yellow 4 pieces

  • Brick 2 x 2 Corner Yellow Part 2357 Element 235774 or 235724 ×2
  • Plate 1 x 1 Yellow Part 3024 Element 302424 ×1
  • Plate 2 x 2 Yellow Part 3022 Element 4613978 or 302224 ×1

Trans-Green 2 pieces

  • Wave / Flame Rounded with Base Pegs Trans-Green Part 6126a ×2

Green 1 piece

  • Plate 2 x 3 Green Part 3021 Element 302128 ×1

[No Color/Any Color] 1 piece

  • Sticker Sheet for Set 7647-1 [No Color/Any Color] Part 62012 Element 4520936 ×1

Minifigures 2 figures

  • Martian Minifigure, checked as a whole figure ×1
  • Mars Astronaut, Sunglasses 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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