Left.W/POWER PARK BRAKE. Right.W/POWER PARK BRAKE. Rotor bolt. A Screw used to secure the Accessory Vacuum Pump to its mounting surface. A threaded stud that secures a vehicle's wheels to the wheel hub. Axle Hub Mounting Bolt. Brake Drum Screw. Disc Brake Rotor Bolt. Disc Brake Rotor Set Screw. Steering Knuckle Bolt. Included with: Hub & bearing, Knuckle assembly.