Alternator woes

[bushcat]

I have a 1987 Toyota Van 2WD.

Washed the engine, was stupid, got the alternator wet. Battery drained overnight. Charged it, started it and had the christmas lights. Started to make noise on the road. Lights would disappear when engine had higher RPMs but when idle the lights would come back on. Pulled the alternator and there seem to be some standing water in it.

Went on rockauto and ordered a replacement, a powerselect 14679N. The one with a heart next to it and the most expensive. I took the old one out and went to replace it with the new one and it wouldn't fit. I pulled it out and it's around a .5mm wider than the old one. I can't push that bearing that's on the bracket in any further, it's pretty much flush and won't budge.

Did I order the wrong part? How can I make this work? Should I try reinstalling the old alternator and see if draining the water fixed the issue? It's dirty as heck, is there a way to clean it?