When fitting a wheel that is wider than 10.5" on the rear of the S197 (2005-14 Mustang), you will need to install an adjustable panhard bar in order to center your rear end. When using wider tires on the back of an S197 Mustang (particularly when the vehicle is lowered) you will notice that the rear end may shift to one side resulting in a lopsided appearance. The adjustable panhard bar will allow you to correct this issue. The vehicle application data for this wheel is a general guideline only. Check bolt pattern, width, back-space (or offset), center bore, and brake caliper clearance to confirm that the desired wheel will fit your vehicle. Many vehicles have been modified & these changes may cause wheel fitment issues (i.e. axle swaps, disc brake / big brake conversions, suspension changes, and other modifications). ALWAYS verify the wheel actually fits on your vehicle BEFORE mounting tires. Wheels are non-returnable after tires have been mounted.