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There are two ways to fit a 12-inch front rotor under the Cobra/Bullitt/Mach 1 calipers: you can have OE 13-inch Cobra rotors machined down to 12-inch OD (shown) or use the front rotors from an '02-and-up Crown Victoria for a bolt-on solution. We've used both with about equal results, and although we prefer the quality of the OE Cobra Brembos, the Crown Vic rotors provide off-the-shelf availability at any auto parts store without any special machine work. To accommodate the smaller 12-inch rotor, the bolt-on caliper anchor brackets must be redrilled to locate the caliper closer to the spindle centerline. Again, you can tap a local machine shop to make the modification, or even easier, source pre-modified brackets from Baer Racing.