60-100-200 amp military generators that I have, all have 7.25" spread between the mounting tabs. Even the 100 amp 4 groove pulley unit (M37, M151, etc) has this same spread.
The military "generator alt current 100amp unit" (that is how it is marked) I have has a 4" spread between the mounting tabs. NSN 6115-01-131-4932, PN A0014629JA. It is a 2 wire polarity with IGN tap.
The 200 amp single voltage (24vdc), is reversible and its PN A0013036AA
I hope this helps.
The military "generator alt current 100amp unit" (that is how it is marked) I have has a 4" spread between the mounting tabs. NSN 6115-01-131-4932, PN A0014629JA. It is a 2 wire polarity with IGN tap.
The 200 amp single voltage (24vdc), is reversible and its PN A0013036AA
I hope this helps.