I'm working with Cass (DoctorDiff) to build a Viper based front disc kit for my Duster. Plan is to test it out on my car and if it all looks good then Cass might put it into production. Here are a couple of photos showing the first prototype mounted on the bench. This setup uses a DoctorDiff hub, Baer rotor, Viper caliper and an AR Engineering caliper bracket. Looks to me like it is going to work just fine. Should have it mounted up on the car in a few weeks.