I did a search because I know it's been posted, but couldn't find it. Are the rear disc brakes all the same size on the GS/GST/GSX? I know the GSX has larger front discs and two piston callipers, but are the rears the same as the others? Thanks

The rears are all the same save for some really early 95 GSX rear VENTED rotors and calipers. (even the calipers are different) They'll work with your setup as well, but after reading the dsm.org archives, they're not worth it, since finding some performance pads for that setup will be next to impossible for such rare, rear brakes.

Otherwise, like I said above, they are all the same. (ex. I have some rear late 95' GSX brakes)

Thanks Jason :)