APDTY 013315 Thermostat With Upper & Lower Water Outlet Housing & O-Ring Gaskets Fits 1997-2001 Ford Explorer/Ford Ranger/Mercury Mountaineer (4.0L; Models With Screw In Coolant Temp Sensors Only) Includes Upper & Lower Plastic Housing Includes New O-Ring Gasket Includes New OE Style Thermostat & Seal Comes Completely Assembled For Easy Installation