Bert - the pic posted above of 58/9 motor has that very ID on it, so it will work, IF you have the trans arms to match [and they're labeled left/right] - with the vacuum motor you have now, the 55-57 style motor will work for you as the arms for the vacuum install are the same as for the earlier electrics, original or repro [the repro motors available are quite good] .... if you don't have the different arms that go with that later electric motor, you're outta luck there
Bill
