Larry, I have a 69 coupe that came with factory air, though non functional. I bought an aftermarket A/C from a company I think called classic air out of Florida for the coupe and it looks very much like to original. It still sits in the box as I am not sure if I am just going to get rid of the coupe as I bought the Vert which is what I really want and I bought the vintage air unit for it and love it.
The only noticiable change is the center vent assebly, the 2 vents that sit in the center look like they came out of a 71 Pinto! Now with that being said, they function better as they can be split to driver and passenger rather than just blowing the air straight back like the factory vent does
86 Pontiac 2+2 69 Firebird Coupe(Under Construction) 69 Firebird 4 speed Vert Driveable but Under Construction 64 1/2 Mustang (Under Construction) 86 Z28 Convertible Weekend driver