Team Tech has a 6 point harness for the Viper. They off a front bar, goes under the front of the seat, for the anti-submarine straps. Like Mark said you won’t need a bar for the shoulder straps.
I went with a 4 point ASM harness from Schroth. No bars needed.
Can’t really help with the rotors. My car came with two piece Stop Techs. I like them.