OLDsBARRY

I found a 1105360 Alternator in a local shop the other day. Anyone know the diff between a 1100890 and this one. They a lookalike?

2blu442

Does it have the raised cooling fins on the back? The sort of diamond shape with raised fins inside it? Also the open faced alternators have 5 or 6 bars behind the pulley. I believe Oldsmobile has the 6. But here's an old thread with photos and a discussion on the 890 alternators.

55 amp open face alternator - ClassicOldsmobile.com