My son has a ‘99 GT with 17x9 front and 17x10.5 on the rear. Tire size is 275/40/17 and 315/35/17 which you could run, but they are about 1.5” smaller in diameter. Also, the Cobra reps are probably meant for an SN95 with lower offsets.
If you run 18’s in the front, tire diameter will probably...