Perhaps crack open a McMaster catalog. I have a friend on the Hummer Network website who does that and he seems to be able to pull rabbits out of hats.
I’m not saying bearings and such will be there BUT it might be worth a shot.
Re.: coils and stators… my dad was a PE who designed and built and rebuilt transformers and such. If you have time and patience you can test and rewind coils and stators, but given that Copper has become a semiprecious metal, it won’t be cheap. You then need to pot everything in special epoxy and then bake the epoxy. I warn you, this path is frustratingly slow and difficult, and when you make mistakes they are unforgiving and take you back to ground zero.
I believe RWH knows people who convert to 24 Volt GM alternators. At least I believe he mentioned that to me. Those would be easier to rebuild and cheaper to purchase BUT you need custom brackets. How good are you at dabbing things up?
HummerH1, Eric knows how to convert to 12 Volt and has done it himself. Ask him how and then use the same brackets for 12 or 24 Volt units.