Bill, these fit the radial mount calipers on the GT350 / GT500. The Mach 1 uses the perpendicular mounted caliper from the Performance Pack.So, assume these will fit a 2021-2023 Mach 1?
Caliper Studs will not work on a perpendicular mount caliper, plus other than a rotor change the calipers never need to come off for a pad change, they are top loading. GT350/500 calipers are fixed bridge calipers that load from the bottom so the caliper needs to be raised to remove the rotor to swap pads.Thanks Tim, another bit of news I was unaware of, appreciate the info as I had a chance for a free set and they would not have worked. I guess I will need to contact you for the correct set in the near future. I assumed after a quick cursory look that the " Handling Package " Brembo calipers were the same on my Mach 1, so glad to find out they are different. I am sure some other folks will appreciate the information.