This four-row Cadillac radiator fits various models from 1965 to 1974. It is equipped with a ¾" heater return in the outlet tank, along with a threaded plug for models that don't use it. The fill neck is flat and the transmission cooler is 12". This radiator can be used on various other GM models, although thw mounting rubbers will need to be changed on most. Please call us at 516-293-2175 for more detailed information.