Is there anyone who supplies a new distributor for an early model A12 engine? It seems like all the new ones are for late models. Or, are the new ones interchangeable? Any help is appreciated.

Any A-series distributor will fit any A-series motor. I've used the matchbox style (from 210) in both my A12 and A15. The B210 electronic unit will fit as well.

Do note that the A12 and A15 use a different distributor mounting plate, so while you can use any distributor you need to use the plate for the motor. Read late motor uses one plate and early uses another style.