1968 GMC Pick-up Truck Clutch Kit K35/K3500 Pickup - 5.3L Engine - Diaph. Cover - Optional Kit/Diaph. w/ HD Disc - O.D 12 I.D 1 1/8 TEETH 10T guaranteed to replace your current 1968 GMC Pick-up Truck Clutch Kit K35/K3500 Pickup - 5.3L Engine - Diaph. Cover - Optional Kit/Diaph. w/ HD Disc - O.D 12 I.D 1 1/8 TEETH 10T. 1968 GMC Pick-up Truck Clutch Kit comes new OEM 1968 GMC Pick-up Truck Clutch Kit aftermarket new 1968 GMC Pick-up Truck Clutch Kit of remanufactured 1968 GMC Pick-up Truck Clutch Kit K35/K3500 Pickup - 5.3L Engine - Diaph. Cover - Optional Kit/Diaph. w/ HD Disc - O.D 12 I.D 1 1/8 TEETH 10T.