I was looking around a few days ago and found that some , if not all, MACH1's came with same calipers as the Cobras but without the logo. I will shearch for them again and post a link.
It is cheaper to buy them seperately from stang suspension than to buy the kit from FFRP ($375 vs.$475). This kit does not include the master cylinder. From what I understand, the some people think that a stock GT master cylinder is just fine (you might want to search for that on your own).
Performance Parts Inc. has the front kits and rear kits for just under $400 each. All hardware needed is included. I got both along with stainless steel lines for just over $800. All parts
PPI has the Bullitt, Mach1, and Cobra logos on the calipers. I got the red Cobra 10th Anniversary brakes for the Cobra name and good looking caliper.
Local mustang shop who did my install was real impressed by the quality and look. I'd recommend replacing front and rear brake stuff if you've still got stock stuff and high miles.