[Fit for V8 4.3L~8.1L Engine]: Compatible with Chevrolet Avalanche 1500 2002-2006, Avalanche 2500 2003-2006, Express 1500 2003-2007, Express 2500 2003-2007, Express 3500 2003-2007, Monte Carlo 2006-2006, Silverado 1500 1999-2006, Silverado 1500 Classic 2007, Silverado 1500 HD 2001-2006, Silverado 1500 HD Classic 2007, Silverado 2500 2006, Silverado 2500 1999-2006, Silverado 2500 HD 2001-2006, Silverado 2500 HD Classic 2007, Silverado 3500 2001-2006, Silverado 3500 Classic 2007
[Fit for V8 4.3L~8.1L Engine]: Compatible with Chevrolet Silverado 3500 HD 2007, Sonora 2003-2004, SSR 2003-2004, Suburban 1500 2000-2006, Suburban 2500 2000-2006, Tahoe 2000-2006, Trailblazer EXT 2003-2004; Compatible with GMC Envoy XL 2003-2004, Envoy XUV 2004-2004, Savana 1500 2003-2007, Savana 2500 2003-2007, Savana 3500 2003-2007, Sierra 1500 1999-2006, Sierra 1500 2003-2006, Sierra 1500 Classic 2007, Sierra 1500 HD 2001-2006, Sierra 1500 HD Classic 2007, Sierra 2500 1999-2004
[Fit for V8 4.3L~8.1L Engine]: Compatible with GMC Sierra 2500 HD 2001-2007, Sierra 2500 HD Classic 2007, Sierra 3500 2001-2006, Sierra 3500 2003-2006, Sierra 3500 Classic 2007, Sierra 3500 HD 2007, W3500 Forward 2003, Yukon 2000-2006, Yukon XL 1500 2000-2006, Yukon XL 2500 2000-2006; Compatible with Buick Rainier 2004-2005; Compatible with Cadillac Escalade 2002-2006, Escalade ESV 2003-2006, Escalade EXT 2002-2006
[Note]: Round Coils with 4-Pin Blade Terminal, not fit the Square Coil models. For more specific information, please check the vehicle compatibility in the product description below.