CJ750 toolbox
Ross Kowalski found a WELLS VR650 12V voltage regulator at AutoZone for $29. It's for a 1973 BMW 2002.

In addition, he mentions that the SMP124 regulator discussed on the CJ Collective web site was connected in this fashion:

Regulator                         Bike

Red -----------------------------> White/black wire

Green --------------------------> Black

Black -------------------------->  Ground

But... on Ross's bike the colors are different:

Regulator                         Bike

Red ---------------------------->  White/black

Green ------------------------->  Green

Black ------------------------->  Ground

From what we've seen with CJs, there's no consistency with wiring colors, especially with newer ones. Different builders use different colors which in fact may vary on bikes coming from the same shop.