Left.W/O RC-F. Right.W/O RC-F. Steering gear lock nut. A Nut which is used in conjunction with a bolt to tighten the adjustment sleeve clamp. A solid metal or plastic block with a threaded hole in the center which is used to tighten or adjust the Brake Backing Plate. Lateral Arm Nut. Nut used to secure the Steering Tie Rod. Parking Brake Nut. Rack and Pinion Nut. Suspension Control Arm Nut. Included with: Gear assembly.