For GM Trucks and SUVs, there are two different type of coils the round body coil and the Square body coil; Please check your original coils to make sure whether you need the round or square style coil Designed and manufactured to operate reliably under all operating conditions and throughout the entire engine speed range for peak engine performance Products are designed to meet or exceed OE specifications in form, fit and function Reduces common ignition coil issues such as; no/hard start, long crank time, misfires, lack of power, inconsistent transmission shifts, spark plug fouling, premature catalytic converter failure, poor fuel economy, check engine light illumination Ignition Coil Set Compatible with Chevrolet 1999-2007 Silverado 1500 4.8L V8, 1999-2007 Silverado 1500 5.3L V8, 2003-2007 Silverado 1500 6.0L V8, 2002-2006 Silverado 1500 HD 6.0L V8, 1999-2004 Silverado 2500 6.0L V8, 1999-2000 Silverado 2500 5.3L V8, 2001-2007 Silverado 2500 HD 6.0L V8, 2007 Silverado 2500 HD Classic 6.0L V8, 2001-2007 Silverado 3500 6.0L V8, 2007 Silverado 3500 Classic 6.0L V8, 2007 Silverado 3500 HD 6.0L V8, 2000-2006 Tahoe 4.8L V8, 2000-2006 Tahoe 5.3L V8, 2000-2006 Suburban 1500 5.3L V8, 2000-2006 Suburban 2500 6.0L V8, 2002-2006 Avalanche 1500 5.3L V8, 2006 Monte Carlo 5.3L V8, 2004 SSR 5.3L V8, 2003-2004 Trailblazer EXT 5.3L V8, 2003-2007 Express 1500 5.3L V8, 2003-2007 Express 2500 4.8L V8, 2003-2005 Express 2500 5.3L V8, 2003-2006 Express 2500 6.0L V8, 2004-2007 Express 3500 4.8L V8, 2003-2007 Express 3500 6.0L V8, 2007 Silverado 1500 Classic 4.8L V8, 2007 Silverado 1500 Classic 5.3L V8, 2007 Silverado 1500 Classic 6.0L V8. Coil Pack Set Compatible with GMC 1999-2007 Sierra 1500 4.8L V8, 1999-2007 Sierra 1500 5.3L V8, 2002-2006 Sierra 1500 6.0L V8, 2007 Sierra 1500 Classic 6.0L V8, 2002-2006 Sierra 1500 HD 6.0L V8, 2000-2004 Sierra 2500 6.0L V8, 2000 Sierra 2500 5.3L V8, 2001-2007 Sierra 2500 HD 6.0L V8, 2007 Sierra 2500 HD Classic 6.0L V8, 2003-2006 Sierra 3500 6.0L V8, 2003-2005 Sierra 3500 8.1L V8, 2007 Sierra 3500 Classic 6.0L V8, 2007 Sierra 3500 HD 6.0L V8, 2000-2006 Yukon 4.8L V8, 2000-2006 Yukon 5.3L V8, 2001-2006 Yukon 6.0L V8, 2000-2006 Yukon XL 1500 5.3L V8, 2003-2006 Yukon XL 1500 6.0L V8, 2003-2004 Envoy XL 5.3L V8, 2004 Envoy XUV 5.3L V8, 2003 W3500 Forward 5.7L V8, 2004-2005 Rainier 5.3L V8, 2003-2007 Savana 1500 5.3L V8, 2003-2007 Savana 2500 4.8L V8, 2003-2005 Savana 2500 5.3L V8, 2005-2007 Savana 2500 6.0L V8, 2003-2007 Savana 3500 4.8L V8, 2003-2007 Savana 3500 6.0L V8. Coil Packs Compatible with Cadillac 2002-2006 Escalade 6.0L V8, 2003-2006 Escalade ESV 6.0L V8, 2002-2006 Escalade EXT 6.0L V8, 2002-2005 Escalade 5.3L V8. Coil Packs Kit Compatible with Hummer 2003-2007 H2 6.0L V8