big brakes, why not the 2012 Stang GT

Don't think it is really in line with what you asked, but you might look into the c5/c6 corvette calipers, too. They actually match baer brake's next level up from the cobra style caliper and are easy to source. That's what I have worked up to put on my Duster with the Cobra rotors and factory hubs created by machining the rotor off.

Can't say they are better than the GT calipers you are talking about, though.

BTW, drum hubs don't work, unless I missed something. I was unable to find a hub that had the big inner bearing to match my disk spindles, and I looked hard.