I am getting more serious about the upgrade and had a few q's. Is there anywhere I can get just the AR Engineering kit w/ out the rotors, I already have them?

What is a good source for the newer '03+ calipers besides e-bay?

Finally can the rear viper brakes be adapted to an 8.75? I was planning on pbr's for the rear which I think will work but was wondering why the viper backs wouldn't work as well.