my dad has a 93 gt that i just finished a sn95 rear disc brake conversion . we ordered 17x9's for the rear with a 275/40r17 tire . to make a long story short it rubs the rear fender lips. due to the longer axles. he has opted to order 2 new 17x8 inch wheels and go with 255's instead. his car is lowered,but i dont think that is main reason for the rubbing. go to
www.northracecars.com for options on how to use 9 inch rims on the rear of your car. hope this helps