Part Type: Engine Coolant Thermostat Housing Seal. 2005 GMC Sierra 1500 HD Engine: 6.0L V8;. 2006 GMC Sierra 1500 HD Engine: 6.0L V8;. Compatible Years: 2005 2006. Ensure that this part fits your vehicle by entering your vehicle's Year, Make, Model, Trim, and Engine in the Compatibility Table.
