High-performance StopTech ST AeroRotor replacement friction ring designed for Dodge Viper Big Brake Kits (BBK). This 355x32mm right-hand side drilled rotor features patented AeroVane optimization for improved cooling and braking efficiency under extreme conditions. The kit includes: 1x StopTech AeroRotor Friction Ring (P/N: 31.737.1202.99), 1x Mounting Hardware Pack (P/N: 299.99.001.07 - Drive Pins, Washers, and Bolts for hat attachment). Note: This is a replacement ring only; the aluminum bell/hat is not included.