most of the hearses are built on a cadillac commercial chassis. Its bigger and heavier made for the limo makers. the customizers order them with specific body parts on or off them. Most hearses are made from Fleetwood parts. Thats strainge most hearses have AC. The AC belt on my 76 (i think, i forget last time i looked at it) is seperate then my AC (two belts). you can take your old one into an auto parts store or measure it with a tape and order it that way.