Any bearing supply house should have those. If he gets it running correctly, a V65 should be almost two seconds faster in the 1/4 mile than a good running Valk. He won't be the spankee!
I had a v65 sabre before the valk. The valk handles better, but you get that v65 in a straight line, you better be ready to hang on.
That v65 magna was the fastest production bike for 5 years IIRC.