Here`s a couple of pics for you the thrift heater as veiwed from the firewall, and the second is the deluxe, either will work, you will need the tube ducts, heater box/fan, core, and related switch, so from `63 to `66 will work, hpefully you`ll find everything on one truck, the thrift heater has much fewer parts other than the core ports coming thru the firewall as shown in the first pic....