This is the only "non-Foose" Pantera I've seen with Foose wheels:
https://www.youtube.com/watch?v=-74IR62VdLc
He (Foose) used an 18"/19" combination. He started off with a 245/325 tire combination but changed to narrower sizes after the car was displayed at SEMA. I am unaware of specifics.
Have you called MHT? They would have all that information. Whether or not they can be bothered to look it up for you is another matter!