You probably already know but the 1500 Alt bearing # is N S K 6000 D U..I just paid ~$6 for a pair of brushes at cyclemaxohio. I also bought 4 rubbers for $16. When I get some bearings, I will be able to pull it out and put it back in.
My alternator is working fine, but a stethoscope indicates a little rumbling noise, so this will be a little preventative maintenance. I would hate forthe bearing to spin or lockup.