Rockauto and others has the United Motor Products says made USA. The rotor is fine if used with cap they make I show. Reason I posted pics of boxes with part numbers.
They must be used a a,set. That rotor used on any other cap will wrecks it ASAP. And I tried many none worked other than the cap United makes.
I put the rotors in the boxes with the caps along with a,note to only use with that cap. And Put them on a shelf for Rainey Day. But have lots of vintage to use before that may ever happen.