The StopTech Sport Drilled Rotor is a 1-piece direct replacement brake disc for the factory braking system. It features a cross-drilled surface that improves heat and gas dissipation while enhancing wet weather performance. The ‘E-Coat’ finish provides long-lasting corrosion protection on the hats and vanes. This is a Left Rear (Driver Side) rotor. For a full rear axle set, this part must be paired with the Right Rear rotor (128.61087R). Specific components in the Sport series include: 128.61087L (1 x Left Rear Cross-Drilled Brake Rotor).