Our V2 Billet Brake Caliper Adaptor Bracket is an ideal upgrade to the V1 caliper adapter brackets included in our Lightweight Rear Staging Brake Kit. It features two incorporated speed sensor mounting provisions, enabling you to quickly and easily mount an M DHALL 437 sensor (sold separately) either above or below the caliper with no fabrication or welding required. This offers invaluable data on your vehicle's true ground speed, which is invaluable information for your Engine Management Software functions. The 11-toothed Ultra-Lightweight slotted steel rear staging brake rotor reads the Hall effect sensor and our bracket is precision CNC machined from 6061-T6 billet aluminum with a black anodized finish for long-term durability and corrosion resistance, and finished with SpeedFactory “SFR” logos. *NOTE: If you have our V1 bracket (no sensor holes), you only need to purchase one of these brackets.