Image Item No. Description  4212a  Vehicle, Base 4 x 10 x 2/3 with 2 x 2 Recessed Center with Center Hole (First Version) Catalog: Parts: Vehicle, Base  52037  Vehicle, Base 6 x 16 x 2/3 with 4 x 4 Recessed Center and 4 Holes Catalog: Parts: Vehicle, Base