1968 Camaro Air Conditioning Control
 

I'm working on a 1968 Camaro with air conditioning and I need a new heater/air conditioning control. I've got the cables so I just need the head. 1967's are different and apparently there are two different types for 1967. Also, the faceplace may be a slightly different colour between 1967 and 1968 and possibly between Camaro and Firebird.

Does anybody know anything about these controls and what I may have to pay for one? They seem to be in short supply and expensive.