Just for a fun comparison here is a four piston Dynpro caliper mounted on an oversized 12.6 inch rotor sitting inside a 15 inch rim.
Still fits but only just . Wheel weights would likely be toast and jam depending on where they were mounted.
I think the 12.2 inch rotors that match the Pantera hat as offered by Wilwood would clear just fine and would be a perfect choice dimensionally.