Loveless wrote:doubt they are much higher
what you are seeing is the color crisis
No no, that's not a color crisis. My car was a color crisis.
Anyway, easiest way to find out what MM you should have your rear, is to measure the distance from your tire to the silvia fender, then measure the distance from your rear tire to the rear fender, then take the difference, that's what you want.
Then there are ppl who like wider fronts/back - personal preference.