I don't think StopTech ever set up the Mopar brakes as a product. You can buy similiar brakes from Baer though. Baer has the 6P setup or the killer 6S setup available for the Mopar big bearing knuckle. They have 13, 14 and 15 inch rotors so you can go as big as you want.

I covered all of the brake systems available for Mopar vehicles in my B-body book. So that is an easy way to scope out all the options.