Review on Metra Electronics 70-5520 Wiring Harness: Ideal fit for 2003-Up Ford Vehicles by Larry Cothran

Do yourself a favor and make sure you don't have a premium sound pack before installing. I used this on my 07 Mustang to replace an aftermarket radio that was installed when I got the car. They made it cheaper and used a wiring harness very similar to this one, so I used the cheap one too. Turns out my car has two external subwoofer amps in the doors and two external subwoofer amps in the trunk (the trunk setup was gone when I got the car) so I just ran door tweeters and rear seat tweeters. I upgraded to a matching $50 hanger and got the full gamut of my sound system. These belts are great, but the information on the internet doesn't always match what you think.