Alternator bearings going bad

Hey guys, So as the title states the bearings in my alternator are going bad and the whine is starting to get annoying. I took it to the dealer but they wanted over $500 to replace it. I started looking around and found a few replacements brand new for about 350-450 and refurbished for around 150. Before I pull the trigger I wandered if anyone has rebuilt theirs? And if so what kit did you use? I tried to find a rebuild kit or the bearings but haven't had any luck yet. I have rebuilt alternators in the past on my XJ so I'm not worried about that.

If I can't find one I'll will end up buying one and if you guys are interested I'll do a write up when I change it.

If you want a regular alternator just go to a parts store not the dealer. I think I only found one place making upgraded alternators for the 3.6 engine which was a 270 amp I think. Stock is 160 amp