Radio Installation

So I wanted to install a touch screen double din, come out to find the wiring harnesses by metra only go to 2008, I own an 09. The difference is the 12v wire for the 09 does not work with the 08 harness and I have to have a special one that has the 12v wires, where can I find one that has both 12v wires needed for a radio?

For the radio I want to use yes, it requires 12v accessory which the metra wiring harness doesn’t work with with the 09 mustang because it uses a computer for the 12v accessory ( from the company’s words ) which is odd since most 05-09 are the same but the paper specifically states up to and only LATE 08 models but not 09