3.5 LITER W/O TURBO. Oil cooler bolt. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Engine Coolant Outlet Housing or related components. Engine Coolant Thermostat Housing Bolt. Engine Oil Cooler Bolt. Engine Water Pump Bolt. HEX. HEAD - Flanged. Controller. Engine Coolant Thermostat Housing. Oil Cooler. Outlet. Thermostat hsng. Thermostat outlt. Included with: Thermostat Housing.