1999-2006 For chevrolet Silverado 2500 / 2500 HD with 5.3L/6.0L V8 Engine. 2001-2006 For chevrolet Silverado 3500 with 6.0L V8 Engine. 2003-2006 For chevrolet Silverado SS with 6.0L V8 Engine. 1999-2006 For gmc Sierra 1500 / 1500 HD with 4.8L/5.3L/6.0L V8 Engine.
