Alternator

I have a 1999 Blazer 4.3l Vortec 4x4 and the alternator has gone bad, however I have been offered a new 8160-11 alternator that was bought for a 1995 4.3l Astro. Will this fit and work ok on the Blazer. The guy bought it in error and so it is going very cheap. I was going to get my one rebuilt but this new one is half the price of what the company were going to rebuild my one for.