Maybe this will help. I put in an aftermarket A/C system because when I bought my 1970 Buick GS 455. The A/C system was non-operational. I wanted a modern A/C system that would be reliable for a ton of years to come. I do not want a A/C system, that was designed and engineered 53 years ago. So I found a excellent A/C company in Florida. Yes. made in the USA. Here is some info for you. Replace original non-functioning Frigidaire A/C compressor with newer, rotary model. The vendor is Original Air, https://www.originalair.com/restoration-gm- compressors Phone: 1-877-544-9023 – 9:30am to 5:30pm EST. A/C – 70-72 Skylark A/C Compressor performance upgrade kit V8 Stage-1 70-72 SKYLARK A/C COMPRESSOR PERFORMANCE UPGRADE KIT V8 STAGE-1 INCLUDING NEW BILLET POA ELIMINATOR, COMPRESSOR, DRYER, HOSES, EXPANSION VALVE, AND LIQUID HOSE Quantity: $1,351.25