[Mr.Fixit]

SPF's have always had the same rotor up front, they simply changed the caliper and caliper braket to allow the use of willwood components instead of ford calipers. I believe that this rotor is 11" but not having one in front of me to measure I cannot say for sure. I've never had to buy any of them either, as brand new left-overs from upgrades are piled up high in the parts room of the shop.The willwood upgrade is not installed at the factory but rather at the local dealer. this is where you get the 12.75" x 1.25" rotors, with alum hat and hub. The calipers are quite different in size too. They are black alum, and say willwood on them but that's where the similarity ends. The rear rotor are the factore ford thunderbird SC brakes circa 1993. Now they too have willwood calipers, but not the big ones. Also, a separate E-brake spot caliper that's nearly useless. Most people honestly will be more than fine with the factory setup, but there's always room to improve for track use.