I think that he's trying to go the other way: from OD to non-OD.
OP: You didn't say what diameter bearing and bearing retainer you're trying to use in the OD bellhousing, there are several different permutations that were used over the years.
Off the top of my head, you could check this out to see if it will fit your needs:
Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists
But your best bet would be to contact Dan Brewer directly and tell him what you're trying to do. He'll know and have your answers.
Brewer's Performance - Mopar A833 4-Speed Transmission and Component Specialists
