This should give you an idea of what you can fit:
http://www.tirerack.com/upgrade_gara...&autoYear=2001
Looks like 18x9.5 up front and 18x10.5 out back. In 17" I know American Racing makes an 11" wide Mustang specific Torque Thrust II that fits with 315/35/17s, but not sure if you could go quite that wide with an 18" wheel. They even give recommended tire sizes to go with the wheels.
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Strike down the unroadworthy!
2000 GT Atl. Blue: '03 Cobra motor - 465rwhp/473rwtq, T-56 6-speed, full MM TA/PH & tubular K-member suspension, Saleen body, 17" Torq-Thrust II's, M/T ET Street radials, and lots more
'94 Rio Red Cobra: All the bolt-ons, 3.73s
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