3.5 & 3.7 LITER. Thermostat hsng o-ring. Engine Coolant Thermostat Gasket. Engine Coolant Thermostat Housing Seal. O-Ring. Thermostat Housing Gasket. Housing Gasket. hsng o - Ring. Water Neck Gasket. Included with: Thermostat Housing, Thermostat unit, Thermostst Housing.