Well . . . I ended up going to a local compressor rebuild shop (industrial stuff) and they had gasket material that they sold me a piece and I made a gasket from it. Not sure of the material, but it was fiberous. The A/C shop I took the car to for the R134 fill, said the system held vacuum great. They got it so you could see your breath in the air flow coming out of the vents with a/c on !!! 1970 Sport Satellite with stock RV2 system. Good luck . . .