3rd gen rear end in 4th gen

[mmikeman]

For the last 6 months been driving around with what I was told was a busted rear end......anyhow being on a budget had to go with a cheap rear end I found locally however the rear end is from an 88 trans am gta (3rd gen) and I have a 96 trans am (4th gen), was told that this will bolt up however because its more narrow stock wheels arn't going to work, figured I can buy some spacers but just wondering what size of spacers I would need? Saw some posts saying 1" should be fine but cant find a lot of people that have done this kind of swap before, any help would be appreciated