FRAME & CROSSMEMBERS. Left.REGULAR CAB. Right.REGULAR CAB. Skid plate bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Diesel Exhaust Fluid Pump Cover to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Skid Plate to it's mounting point. Catalytic Converter Bolt. Catalytic Converter. Converter and pipe. Diesel Emissions Fluid (DEF) Pump Cover. Diesel Exhaust Fluid (DEF) Pump Cover. HEX HEAD. Powertrain Skid Plate. Screw.