pony rims

I'm currently deciding on whether an 04 cobra IRS will be able to fit 17x9, 24mm offset and 5.94in backspacing into a foxbody mustang. The rim has Nitto 275's https://lmr.com/item/WTK-1007NZAK/Mustang-Pony-Wheel-Tire-Kit-5-Lug-17x8-9-Silver-Nitto-NT555 I have heard that some people mill down...