General Motors 89018168, Engine Coolant Thermostat Genuine Oem:Yes, Category 2:Cooling System, Fitment Footnotes:Incl.gasket, Alternate Item Name:Engine Coolant Thermostat, Quantity Needed:1 Brand:GM, Fitment Type:Direct Replacement, Superseded Part Number:89017851, Item Name:Engine Coolant Thermostat, Category 1:Cooling System Manufacturer Part Number:89018168, Category 3:Cooling System, Other Part Number:89017851, 12587396, Part Ref# On Diagram:ONLY PART REFERENCE #6 ON THE DIAGRAM IS, Sme:_3669