Baer brake systems are created to exceed the demands of the most serious car enthusiasts. If you consider yourself one of them, Baer products are for you. They are designed as an upgrade for the highest performing street vehicles and can provide optimum levels of strong, progressive braking during aggressive street and track driving. To find Baer brake parts for your Mustang follow this link: Ford Mustang Performance Brakes Pads, Rotors, Calipers
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Will these work with Mustang stock 14" and or 15" wheels?
I bet they would hate to say for sure with all the variables but to give you a reference I have the fomoco disc 11.2"? dia. rotors and 14" wheels and there is barely a mm or two of space between the wheel and caliper, it is a tallish caliper though IMO. In your search you need to look for a rotor of +/- 12" to fit under a 15" wheel and still they are enough variable to work with one set and not another. The late model "fancy" brakes do seem to have a lower profile caliper at least.