Here's an excerpt for a post I made some time ago about replacing an alternator supplied by Vans:
"I decided to buy a re-manufactured alternator from Denso which is the new name for the original manufacturer. These alternators are not made new by them any more. The alternator I believe is the closest replacement is part # 210-0637
http://densoautoparts.com 1987 Suzuki Samurai. I hoped the best quality re-manufacture would come from the original manufacturer.
I did have to file 3mm off the bracket the alternator mounts to, but I believe this was probably due to inaccuracy in the alternator housing casting rather than a different spec.
I ground ran the engine yesterday and flew it today with no overvoltage issues at all. I am not sure if my logic was correct but the result seems to be good."
I have ~40 hours on the replacement alternator now and all looks good.