I am looking at installing a PowerGen alternator that look like the original generator on my 1954 3100. It currently has a 10SI alternator so the bracket is not the original. I cannot find any specs on the original generator length. I have seen a few 7" bracksts on line. If that was the original bracket size I assume the generator was only 6". The 6" PowerGen alternator is 75 Amps. The long version is 12 " and 90 Amps. Plenty of room in the engine bay for the long, but it the original generator was only 6" long I may need to use the short. Anyone have info?