Buy OEM 2013 Chevrolet Part # 12551507 (12553106). Thermostat. Gasket. Seal. 1/2, 3/4 & 1 Ton, 1996 New Style, 4.3, 5.0, 5.7 liter. 2003-14. 4.3 LITER. 4.3, 5.0, 5.7 liter. 5.7 LITER. 6

2nd Design. Engine Coolant Thermostat Gasket. O-Ring. Thermostat Housing Gasket. hsng. Engine Coolant Housing. Water Neck. Included with: Seal is included with Thermostat, Thermostat.

Engine Coolant Thermostat GasketEngine Coolant Thermostat SealEngine Coolant Thermostat Housing Gasket

1/2, 3/4 & 1 Ton, 1996 New Style, 4.3, 5.0, 5.7 liter. 2003-14. 4.3 LITER. 4.3, 5.0, 5.7 liter. 5.7 LITER. 6 cylinder, w/high output. 8 CYLINDER, 1993-97. All Models. Diesel.