Image Item No. Description  854-1 (Inv)  Go-Kart 206 Parts, 1978 Catalog: Sets: Technic: Expert Builder  872-1 (Inv)  Two Gear Blocks (Gear Reduction Kit) 77 Parts, 1978 Catalog: Sets: Technic: Expert Builder  961-1 (Inv)  Expert Builder/Gear Parts 78 Parts, 1978 Catalog: Sets: Technic: Expert Builder