I was wondering if anyone has run into the same problem as me and has any inof that will help me out? I am building a 1986 ford mustang gt, I have installed a granatelli motorsports K-member and a arms, eibach pro street coil overs, 94-95 spindles with baer brakes, eibach caster camber plates, but when I bolted my fenders and bumper cover back up the tires hit the fenders. The wheels seem to be set forward in the wheel wells know, the rims are 2000 y2k cobra rims with 255/35/18 tires. I was wondering if anyone had any ideas?  

Looks like the K member setup you used moved the wheels forward enough that fitment with the 18in Y2K's became a problem. I'd say contact GMS and see if they have a fix for your dilemma before shopping smaller wheels or opening the wheelwells...