4 1/2" bolt pattern rotors

There is an old thread here that details what you have to do to swap on '66 Mustang rotors with a 4 1/2" bolt circle. There was a slight bit of machining needed and the big sticking point was a grease seal, but they came up with one that works. Even has part numbers for the parts you will need. Do a site search with Mustang rotor as the key word. It'll show up.