I'm pretty sure the internal parts of the Borg Warner OD units are the same, no matter what the application. Only the outer housing was changed to accommodate different vehicles. You might be able to find internal parts somewhere like Hemmings Motor News, or similar publications. The cost to have a one-off piece made by a machine shop would probably be extremely high, with no assurance it would work.
Jerry

"It is better to be silent and be thought a fool than to speak and eliminate all doubt!" - Abraham Lincoln
Cringe and wail in fear, Eloi- - - - -we Morlocks are on the hunt!
There is nothing noble in being superior to your fellow man; true nobility is being superior to your former self. - Ernest Hemingway
Love your enemies and drive 'em nuts!