High-performance StopTech ST AeroRotor replacement friction ring designed specifically for Dodge Viper Big Brake Kits (BBK). This 355x32mm drilled rotor ring features patented AeroVane internal fin design to optimize airflow and cooling capacity, reducing brake fade under extreme conditions. Position: Front or Rear Left side. The package contains: 1x AeroRotor Friction Ring (P/N 31.737.1201.99). Please note: Mounting hardware (nuts/bolts) and aluminum hats are not included and must be reused or purchased separately (Hardware Kit P/N: 299.01.0001).