Factory Sealed Units -Includes Gasket Replacement OE number: S20008, 217-2422, 12580760, 12572658, ETB0024, 12679524 Direct Fit Bolt On Part. Easy Installation Compatible with 2006-07 Buick Rainier V8 5.3L; 2007-08 Cadillac Escalade; 2007-08 Cadillac Escalade ESV Compatible with Chevy 2007 - 2008 Avalanche / 2008 Express 1500 5.3L / 2008 Express 2500, 3500 4.8L, 6.0L / 2007 - 2008 Silverado 1500, 4.8L, 5.3L, 6.0L / 2007 - 2008 Silverado 2500 HD, 3500 HD 6.0L Compatible with GMC 2005 - 2008 Envoy 5.3L / 2007 - 2008 Sierra 1500 4.8L, 5.3L, 6.0L, 6.2L / 2007 - 2008 Yukon XL 1500, 2500