40-60 Medium Duty 26 70-80 Heavy Duty 26 Bel Air 53 Biscayne 43 Brookwood 43 C10 Panel 31 C10 Pickup 32 C20 Pickup 33 C30 Panel 31 C30 Pickup 33 C40 28 C50 26 C60 25 C70 22 C80 22 Corvair 34 Corvette 64 El Camino 44 Impala 55 K10 Pickup 33 K20 Pickup 33 P10 Series 25 P20 Series 26 P30 Series 27 Sedan Delivery 38 Suburban 37 Truck 39