For 1978 GMC K35 Radiator Cap 48774JCBS Safety Lever -- Relief pressure 16 lb

For 1978 GMC K35 Radiator Cap 57594KDYQ Standard -- Relief pressure 16 lb

For 1977 GMC K35 Radiator Cap 99492DZXM Standard -- Relief pressure 16 lb

For 1977 GMC K35 Radiator Cap 55618MQQK Standard -- Relief pressure 16 lb

For 1978 GMC K35 Radiator Cap 84229DFHF Safety Lever -- Relief pressure 16 lb

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

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

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