A few weeks back someone posted about changing from the military generator to the altinator. We e-mailed back and forth and he asked me where he could find one...Well stupid me deleted the message by mistake...anyway here is the answer finaly. Most M series surplus dealers have them. But here are a few you can take a look at.
T.W. Murray (mostly M151 and M35, but a GI alt is a GI alt just the pulleys are different) www.tnjmurray.com
CME Arma Inc. Miami FL, 305-633-1524 (not cheep but supose to be good company will rebuild gens also)
Rapco www.rapcopartscompany.com (Mark is a great guy and he may or may not have one, but might know where to get one.)
Riv-Rad Inc www.muttparts.com (mostly m151 stuff, but again it is a mill standard part.
These are also good sources for parts that are military standard like light switches etc.
Sorry for the delay in getting this info out.