OK, thanks. I looked at the Cometic. Just over a bill - definitely not your run of the mill "Mr. Gasket" stuff.
I've searched for Total Seal rings, with 3.915 bore and 1/16-1/16-3/16 rings. Found a couple of places. Is it better to get something a tiny bit bigger and file back to the proper gap, or does ordering the exact size usually get ya in the ballpark with just a little bit of tweaking needed?