I intend to keep R-12 in there. I just had the STV (prior to the POA), A-6 and drier rebuilt with a brand new evaporator installed. It was extremely difficult to find a new piston for the STV. A few places still have the diaphragm and o-ring kits. I am just worried if something happens to mine I may...

Looking for parts for my ‘66 Corvette a/c setup. Is there any overlap with other GM vehicles for things such as the suction throttling valve (STV)? Can I use one from a 62-65 Cadillac or Buick? Or were they unique for the Corvette?