Image Item No. Description By  26021  Vehicle, Base 4 x 5 Roller Coaster Car Catalog: Parts: Vehicle, Base 375  26021c01 (Inv)  Vehicle, Base 4 x 5 Roller Coaster Car with Dark Bluish Gray Wheels (26021 / 24869) Catalog: Parts: Vehicle, Base 41  24055  Vehicle, Base 4 x 6 x 1 2/3 Curved Catalog: Parts: Vehicle, Base 1  52036  Vehicle, Base 4 x 12 x 3/4 with 4 x 2 Recessed Center with Smooth Underside Catalog: Parts: Vehicle, Base 1  11650c01  Vehicle, Base 5 x 10 x 2 1/2 with Mudguards and 6 x 2 Recessed Center with 3 Holes with (Same Color) Wheels Holders Attached Catalog: Parts: Vehicle, Base 60  65202  Vehicle, Base 6 x 10 x 1 with 2 x 4 Recessed Center and 2 Holes Catalog: Parts: Vehicle, Base 1