Norton transmission bearings

I know this questions has been asked many times probably but please bear with me.
What USA made bearings can be used in my 1971 Norton transmission gearbox?
Mainshaft, Layshaft, and Sleeve gear bearings?
I would need manufactures part numbers.
Also what would you recommend ?

Anything is better than Portuguese-made crap. And anything that's labeled "Timken" is good. A good baring house should be able to cross-reference anything you bring in.