I did the 18's as well. It looks like your wheels stick out a bit from the fenders like mine do. Is that correct? Hard to tell from you pic, buit am curious.
http://www.themorgansite.com/Mustang/mustang_info.htm
How do you like your D-Specs? I am contemplating them and am hoping to reduce rear end wheel travel on my lowered stang. The stock shocks are pretty compressed after installing the BMR 1.5 (rear) lowering springs.