Fits the folllowing vehicles: 2004 Rainier 5.3L 2003-2006 Escalade 5.3L, 6.0L 2003-2006 Escalade ESV, EXT 2003-2006 Avalanche 2007 Express 1500 5.3L 2003-2007 Express 2500, 3500 6.0L 2007 Express 2500, 3500 4.8L 2003-2006 Silverado 1500 4.8L, 5.3L, 6.0L 2007 Silverado 1500 Classic 2003-2006 Silverado 1500 HD 6.0L 2007 Silverado 1500 HD Classic 6.0L 2003-2004 Silverado 2500 2003-2006 Silverado 2500 HD, 3500 2007 Silverado 2500 HD Classic, 3500 Clasic 2003-2004 SSR 2003-2006 Suburban 1500, 2500 2003-2006 Chevrole Tahoe 2004 Trailblazer 5.3L 2003-2007 W3500, W4500 Tiltmaster 2003-2004 Envoy XL 5.3L 2007 Savana 1500 5.3L 2003-2007 Savana 2500, 3500 6.0L 2007 Savana 2500, 3500 4.8L 2003-2005 Sierra 1500 4.8L, 5.3L, 6.0L 2006 Sierra 1500 4.8L, 6.0L 2007 Sierra 1500 Classic 4.8L, 5.3L, 6.0L 2003-2006 Sierra 1500 HD 6.0L 2007 Sierra 1500 HD Classic 6.0L 2003-2004 Sierra 2500 2003-2006 Sierra 2500 HD, 3500 2007 Sierra 2500 HD Classic, 3500 Classic 2004-2007 W3500 Forward 2003-2007 W4500 Forward 2003-2006 Yukon 4.8L, 5.3L 2003-2006 Yukon XL 1500, XL 2500 2003-2007 H2 Replaces part numbers: 12679525, 12570800, 977-307, 977307 This is a compatible replacement part manufactured by AA Ignition. This throttle body is NOT a genuine OEM part. Vehicle makes and their associated vehicle models and part numbers are used in this listing only to identify the vehicles this throttle body fits.