I have a set of those 05 GT brakes on the shelf that I bought from Saleen to look at that possibility. The rotors are 12.4" and exact same design as 13" COBRA rotors,same offset and thickness. The calipers are,in my opinion, a heavy duty version of the Cobra calipers, albeit with more springs, and other superfulous hardware on them. Bad part is the bolt pattern is wider than the Cobra caliper. There is barely enough room for the width of the Cobra calipers on the brackets due to space restraints between the upper ball joint part of the spindle and the radius arm (tie rod)part. Plus, the caliper would be closer to centerline, so even less room is there. All that said, It could be done if a bracket was fabricated. When I bought the brakes from Saleen, they cost $49 + $25 shipping for new take-off calipers, hoses, and rotors! I think they doubled that now but still a great buy. I am going to hang onto mine for spares for my 05.