Crockett, looks to me like the front scope ring was made for the objective bell of a particular scope.  Total guess, but likely a 44mm objective glass that might go up to 47mm with the bell.  Per Der Ami, I'd bring some calipers to a store and see how close 1" tube-scopes with 44mm objective glass are to the 47mm, and there isn't much room for error.  If they're larger, a machinist might be able to skim off some of the metal within the rings.  Worth a shot!
I had to have rings made years ago and they weren't cheap, but worth it IMHO.