For 1978 GMC P35 Radiator Cap 23739KTXM Safety Lever -- Relief pressure 16 lb

For 1978 GMC P35 Radiator Cap 93139GHTS Standard -- Relief pressure 16 lb

For 1978 GMC C15 Radiator Cap 57133CV Safety Lever -- Relief pressure 16 lb

For 1978 GMC P35 Radiator Cap 95872QQNT Safety Lever -- Relief pressure 16 lb

For 1978 GMC G25 Radiator Cap 72942DDQR Standard -- Relief pressure 16 lb

For 1978 GMC C25 Radiator Cap 71932CJJP Standard -- Relief pressure 16 lb

For 1978 GMC C35 Radiator Cap 13418MGRY Standard -- Relief pressure 16 lb

For 1978 GMC K15 Radiator Cap 13977RNBR Standard -- Relief pressure 16 lb