Just to be clear, you need .020" undersize rod & main bearings for an RB crank w/ radius fillets, right?

EDIT: Nope, don't see any that'll cut it OOB. I suspect you may need to resort to using standard Clevite 77 or Sealed Power CP-series .020" rod bearings & .020" full-groove main bearings, some fixtures like these HERE, and finding someone w/ a lathe to narrow them, assuming you don't have a lathe yourself.