We are trying to get the Air Conditioning system working in my wife's 1965 Buick GS. The Air Conditioning Heater Assembly (case) is cracked and beyond repair. Would any of you "1965 Buick GS Experts" have one for sale??? I'm not positive of the technical name of this part but there is a drawing of it in the 1965 Buick Chassis Service Manual for 43000 and 44000 Models on page 11-63 (Figure 11-111) on the left side of the drawing. My Parts book says this Assembly (case) is supposed to fit Skylark/GS 1965-67. I believe Buick called this system "Optional Heater with Air Conditioner". Also, would anyone know if this part was used in the 1965 Chevelle, GTO, or 442? I'll try and attach some (4) photos. Thanks, Richard