Image Item No. Description  3475b  Engine, Smooth Small, 1 x 2 Side Plate with Axle Holders Catalog: Parts: Aircraft  3475a  Engine, Smooth Small, 1 x 2 Side Plate without Axle Holders Catalog: Parts: Aircraft  2415  Plate, Modified 2 x 2 Thin with Plane Single Wheel Holder Catalog: Parts: Aircraft