x1 BB0961C01Medium Stone GreyElectric Battery Box Powered Up Bluetooth Hub with Dark Bluish Gray Bottom
x2 61408Medium Stone GreyTechnic, Liftarm, Modified Crank / Pin 1 x 3 - Axle Holes and Squared Pin Hole
x4 31794Medium Stone GreyTechnic, Steering Arm 5 x 1 with Tow Ball Socket Rounded, Chamfered (Type 2)