let's see if the link works:

http://shop.advanceautoparts.com/c3/radi...IdSearch=166788

should show all Imperial units from non thermal to heavy duty.

In fact Imperial seems to be the only Advance offers, because on search I didn't specified any brand.

made the search to my 74 Charger with 400. Got the Heavy Duty due the AC setup.

MP unit is not HD, just Thermal.

With a Charger born in Chrysler assembly plant in Valencia, Venezuela