Image Item No. Description  54802  Flywheel Inertia Motor 9 x 4 x 3 2/3 Catalog: Parts: Motor, Non-Electric  42073c02  Windup Motor 2 x 6 x 2 1/3 with Raised Shaft Base - Long Axle (Sports) Catalog: Parts: Motor, Non-Electric  42073c01  Windup Motor 2 x 6 x 2 1/3 without Raised Shaft Base - Short Axle (Sports) Catalog: Parts: Motor, Non-Electric