That is the factory forged aluminum wheel for the base model 2013-2014 Shelby GT500 Mustang; no GT model ever came with this wheel.
For the GT500 the factory sizes are actually 19x 9.5" for the front, and 20x 9.5" for the rear.
Fortunately for you, Ford Racing is selling that exact wheel. It is still a forged aluminum wheel, only comes in 19x 9.5", and only in black. If you don't like the black, buy them and have a wheel repair shop paint them, as they know exactly how to paint these to look like the factory nickel color.
$1456.00 is the best price I've seen for a set of 4, with TPMS and TPMS trainer tool, with free shipping at the moment. Link below.
Ford Racing Wheel Kit - 2013 GT500 Style - 19 X 9.5" With TPMS Sensors (Part No: M-1007KIT-SA1995)