I'm running 2" wide spacers in the rear.. but mainly because My Brembo brake kit from Stillen (early version) had a MASSIVE 2 piece brake rotor hat. I think it was about 1.5" thick... so I also had to install longer wheel studs. It was basically a brake rotr+wheel spacer setup (perhaps to clear the brembo F40 caliper?). Anyway, the front stuck out way more than the rear, so the 2" rear spacers fixed that, and now it looks proper. I wouldn't worry too much about spacing out the rears... because it's a solid axle, and you don't have too worry too much about suspension geometery.