And I know I need a 1A2 Keyset Unit. And this is where things get > fuzzy for me.
The Antique Telephone Collectors Assocation (ATCA) and Telephone Collectors International (TCI) would be the places to contact for assistance with this type of thing.
[TELECOM Digest Editor's Note: I can tell this much; no one,but no one tampers with or tries to rewire the inside of a 1A2 phone. The wiring is just too complex. All the rewiring is done in the box on the wall where there is room to move your arms and fingers, _not_ in the phone itself. PAT]