1951 Elmer,
I just put a 63 amp, three-wire GM type alternator on my 54 3100. I modified the stock generator brackets to work. The bottom braket was slotted to connect the two holes in it. I then used 3/8" allthread and some nuts and washers to secure the bottom mount. The top mount had to be flipped over with no other mods. Looks pretty good and feels very secure.
