1997-2000 GMC K3500 6.5L V8. 1991-2000 GMC K3500 5.7L V8. Notes: Engine Coolant Outlet O-Ring -- 1.954in I.D.; Improved Design. Ensure Proper FitTo confirm that this part fits your vehicle, enter your vehicle's Year, Make, Model, Trim and Engine in the Compatibility Table.
