StopTech Sport Rotors are 1-piece direct replacement brake discs for factory brake systems and stock calipers. The 127.47023L model features a cross-drilled and slotted surface finish (Left Rear) that aids in heat and brake dust dispersal, prevents pad glazing, and improves wet weather braking performance. This specific part is designed for the 2005-2007 Subaru Impreza WRX STi with a 5x114.3 bolt pattern. This is a single left rear rotor. For a complete rear axle set, it is recommended to purchase the matching right-side rotor (StopTech 127.47023R).