I came across one site that had them, but lost it when my computer crashed. But 2005 Mustang GT brakes are the same height as the stock Toyotas. I'm starting on a set of 05 Mustang rotors when I get back from Vegas. I'm setting the rotors on the back of the Toyota hub, and machining the Toyota hub bolt holes larger for the GT rotor. The only real reason for going through all that work is these can be had for $150 or so with brand new rotors, calipers, and pads, while the Toyota big brake kits were around $1000 or so.
http://www.newtakeoff.com/mustang_gt_front_brake_caliper_and_rotor_set_2005-2009.aspx Hope that helps a bit with some other options.