Kevin, what the manual says, and what you intend to do after rebuilding, can be called pairing by a lot of people.
Commentary:
"Pairing" can be defined as "adjust" the VR while a certain polarized gen is running or in static mode, using the ammeter or other meter, as I read the manual. Done after a rebuild/cleaning or new. On the other hand, the concept of interchangeable parts which was in full force way back, says parts off a shelf should work with each other. I don't think soldiers in the field or folks broken down, ever did anything but replace and drive. If the ammeter didn't act right, and they were mechanically inclined, consumers would adjust per manual or take it to a shop. Whether pairing is or is not the right word, the answer is: parts off a rebuild bench or off a store shelf will probably work OK. Usually rebuilt or new parts get some kind of "final test" procedure...or in the USA they did. Probably in China they do also....as demanded and batch checked by USA "global" companies. If a local shop, in business for a long time, wants to test parts together, it's a sign of a very good shop.
Most times the warranty can tell you how they feel about their parts.
