StopTech Sport Drilled Rotor (Left Front). Part Number: 128.34019L. High-performance 1-piece direct replacement brake disc. Features: Cross-drilled for improved heat dissipation and outgassing; Zinc coating for corrosion resistance; Enhanced cooling fins for better thermal management. This is a single component (Left Front), however, it is typically used in a set with: 128.34019R (Right Front Rotor) and StopTech Sport Pads (309.07770).