GM 2007 - 2018 Maximum Clearance NotchCastle Manufacturing brings you the option of running big, wide wheels, without the need of doing an entire back half, or the need for a fuel cell. Also provides you with plenty of clearance for running big brake kits. Our notch design makes installing them a breeze, as the main half comes pre assembled and shaped. simply line up our integrated centering mark with the center of your axle and go from there. Features and Benefits * Eliminates the need