I have Chevy C1500 1990 which i have instaled a 6" & 4" lowering kit on. and cut off 1 "lap" of the front springs too get the "stance" right...

So now my question is, wich messurments should i have on the rims to make them fit inside the fenders. i´m going for 20" wheels...

Excuse my bad English (swedish guy)