Wanted this for a 1971 ford Torino with the original thermostat housing, it had to be cut to size and on of the sides seems to small to fit the thermostat housing, it will fit the size of the water pump outlet but on older model thermostat housing the size is questionable might fit a modern up to date thermostat housing or maybe taking off the housing and forcing into it. But the difference was clear, probably 1/4 of an inch difference between the water pump size and the thermostat housing on older model.