I once measured a Mustang GT of the same generation. Its 255/45ZR19 front tires were mounted on 19-by-9 inch wheels ... The GT500 is the only Mustang set up this way, and it required additional ...

Ford Racing Performance Parts has announced the introduction of a new set of forged aluminum 19-inch wheels for the 2005-2014 Mustang GT, the 2007-2014 Shelby GT500 and the 2005-2014 Mustang V6.

Unless your Mustang is destined for stage rally ... identified the need for lowering springs for 2015-current S550-chassis Mustangs. This 2017 GT was ready for the lowering treatment.