After I R&R'd the original compressor on my '83 to replace the shaft seal, I still noticed some oil on the steel housing. In order to keep from wasting R-12, I replaced it with a new one. Upon removing the steel shell from the original, it was like brand new inside. What was leaking were the large "O" rings that seal the housing to the body. I replaced them, and kept the unit as a spare. If anyone is interested, I'll get the Mcmaster-Carr part # for you.