GSL-SE's already have the same bolt pattern and brakes as the 4 lug 2nd gens, but if you want to change over to the 2nd gen alum hubs or change to the 5 lug, 4 piston calipers and larger rotors then RE Speed (
http://www.mrcmfg.com/catalog/ ) has the kits for doing fronts, rears, as well as change over axles for the 5-lug conversion... plus other upgrades...