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What are HC refrigerants and do you have any specs comparing it temperature wise to R-12?

I was at the Chrysler as Carlisle show at my spots and someone told me one of them is for A-body and the other one with the cast heavy duty bracket is for a early 60's car. Not sure what the big one goes to but probably a C-body. I love R-12 and wish I could find someone to put in R-12. Going to...

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I have 3 A/C pumps with these part numbers. Can someone decode them or can someone tell me what the difference in A/C pumps are? Big pumps. Little pumps? What is correct way to identify which pumps go to A,B, or C body? The part numbers on them listed right under the S/N# are. P/N# 2843602...