Walt Sweeney doesn't have the part in stock that I ordered elsewhere (HU5Z-19A387-A), but they do have part # GJ7Z-19A387-B in stock. The person I spoke with says he has received no complaints from Mustang owners using this part, even though it's a Lincoln part. It is a dual USB port, not single USB, but the part is the same dimensions, so it should fit.
Also, the USB port is illuminated white, which is a Lincoln thing and blue is Ford, according to the person I spoke to.