rim width

[stang94X]

hey everyone, i dont have my car right now and i need to get rims for the rear of it for when i get the car back and i was wondering if anyone knew what the widest rim that i can fit on it without having any trouble with the extra width of the tire

 

[Suspect]

ive never seen anyone run anything wider than 17x10.5. and most people put 315s on em.