2013. 2500. Front Upper. Left.4WD. Right.4WD. Upper cntrl arm bolt. A fastener used to secure a Control Arm. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Steering Gear Box or related components. Part cannot be reused/reinstalled. Rack and Pinion Bolt. Ball joint screw. HEX Flange HEAD. Link. Mount. Rack and Pinion. Steering Gear Box. Suspension.