No they aren't standard. Only about 1/10 of Mustang GT owners purchased these in 2014. The rotors are 14 inches v. 13 for standard and the BBP cars are 4 piston v. 2. They are totally worth it. You can but take off calipers, BBP rotors and lines and they'll bolt up to your standard spindle no problem. The master cylinder is fine with this as well.