The GT500 is supposed to be the same caliper, they are made for the OEM's and are not the same as the GT6 series calipers. I got one for a 2013 SRT8 Grand Cherokee. They are listed on Ebay for about 300 each. The Ford Part number is DR3Z-2B164-A for the anti rattle clips and bridge bolt. For 32.00, I could not build the bridge bolt, considering my time. Since my lathe is down, it is more of a pain than its worth. I still have to drill the rotors, I should see how the mustang rotors fit compared to the GC rotors. Projects like this get expensive if I start buying parts just to see if they fit. Tim

Well the rotors are thinner on the GT500, the bridgebolt is too short...by about 3/8", but at least now I have a pattern to work from...crap, another 30.00 wasted unless I modify the bolt I have and making it work. Tim