Mike, further to what Jon wrote; I am in the process of installing my EPB's. As my rear rotors are 12.19" x 1.25", I have to fab brackets and caliper spacers. Both are quite easy to make. As an alternative to spacers, you could simply machine or file a bit of material off of the pads. I think about 0.10" would be enough and there would be tons of thickness left. As far as I can tell, the calipers must be mounted on the rear set of mounting lugs as they could interfere with the coil springs if mounted on the front. Also, I don't think they will be close enough to the mufflers for heat to be an issue. The calipers themselves are quite light and keep in mind, you lose the weight of the OEM handbrake assy., brackets, cables, etc. As Jon mentioned, these EPB's are designed to work on a 5,400 lb. Tesla Model S, so they are definitely overkill for a Pantera.
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