Hi, Our 67 seeedan has rear heat. The heater core, blower, and ductwork are all parked on the passenger side under the speaker deck with a chunk of black rug hanging down to hide it. The spare mounts flat beside it taking up the rest of the area under the speaker deck. Alas, no aircon, tho. The floor in the back seat has a notch approx 1X4 centered on either side of the hump where the floor meets the seat bottom to duct in heat. Dave 67 Haze Green Sedan Covington, Wa.