With the right combination of driveshafts, you can make any of the 1st gen rears fit. The only issue you will run into is with a thread change on the brake lines. I believe
www.re-speed.com sells an adapter set for that purpose.
A GSL will have 4x110 spacing and disc brakes/lsd
A GSL SE will have 4x114(?) spacing and disc brakes/lsd
So, unless you want to end up with an unintended wheel change, be careful which rear you get.
.