4.0 LITER. An o-Ring which prevents Oil leakage at the Engine Oil Cooler line fitting. Automatic Transmission Oil Cooler O-Ring. Cooler to Bracket. Engine Coolant Thermostat Housing O-Ring. Engine Oil Cooler O-Ring. Gasket For Oil Cooler. Towing Package. Coolant Thermostat Housing O -. Gasket. Line Connector O -. seal. Automatic Transmission O -. Bracket o -. Thermostat hsng o -. Included with: Oil Cooler, Thermostat Housing, Thermostat Housing Part cannot be reused/reinstalled.