These pics are of a used alternator I picked up. My car is a 90 325i and this alt looks a little different, it doesn't have the voltage regulator unit on the back of it. Can I get some help identifying it? Can it work in my car? It looks like it will bolt in with no problem, and I'll use the rear plate from my old alt (assuming the rear bearing is in good shape and also assuming I can even do this) so that it has the removable voltage regulator. Will the front pulley swap over?
I strongly suspect I won't be able to mix and match parts like that. The reason I'm replacing my existing alt is the bearings are pretty noisy and I'd like to swap it out before it seizes up and leaves me stranded.
Does anyone know what I have here?

I strongly suspect I won't be able to mix and match parts like that. The reason I'm replacing my existing alt is the bearings are pretty noisy and I'd like to swap it out before it seizes up and leaves me stranded.
Does anyone know what I have here?
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