Trying to bring the A/C back to life.

In general RV-2 parts are getting harder to come by. I don't know if any one source is better than another if you can find what you need. Try Action AC at http://www.action-ac.com/ they list the RV-2 gasket set as MT-2110 and shaft seal as MT-2034. I don't think you can get the pan gasket separately anymore. My local NAPA used to have the shaft seal kits but, I haven't tried recently. You could try an internet search for RV-2 shaft seals. There also seem to be a number of EBay sellers that have them. I would be careful, though with real old stock as the big o ring may not be R-134A compatible.