Thanks for the quick response; this is really a great group. I called a local parts supplier and they ordered one for me from Memphis; it should be here on Monday. CMARTIN, I may be contacting you if they don't come through; thanks for the offer.
I discovered the hard way that the oil supply line has SAE (9/16" and 7/16") fittings rather than metric, so I ordered one of those as well. My plan is to see if the bolt fixes the leak (not likely if past experience is any guide) and install the new seal if not.
Thanks again for the help.