Introduction An ignition coil/spark coil is an induction coil in an automobile's ignition system that transforms the battery's low voltage to the thousands of volts needed to create an electric spark in the spark plugs to ignite the fuel. The amount of energy in the spark required to ignite the air-fuel mixture varies depending on the pressure & composition of the mixture, & on the speed of the engine. An ignition coil consists of a laminated iron core surrounded by two coils of copper wire. Maxpeedingrods provides ignition coils compatible for Buick, Cadillac, Chevy & compatible for GMC series. Applicaiton 2004compatible for Buick Rainer 5.3L 2002-2004 compatible for Cadillac Escalade 6.0L 1999-2006 compatible for Chevy C, K 1500 compatible for Silverado Gen III LS1 Vortec Trailbazer 4.8L 1999-2006 compatible for Chevy C, K 1500 compatible for Silverado 4.8L 1999-2006 compatible for Chevy SSR 4.8L 1999-2006 compatible for Chevy C, K 1500-2500 compatible for Silverado, Ssr Gen III LS1 Vortec 5.3L 1999-2006 compatible for Chevy Suburban, Tahoe Gen III LS1 Vortec 5.3L 1999-2006 compatible for Chevy C, K 2500 compatible for Silverado Gen III LS1 Vortec 6.0L 1999-2006 compatible for Chevy Suburban, Tahoe Gen III LS1 Vortec 6.0L 1999-2006 compatible for GMC C, K 1500 Sierra Gen III LS1 Vortec, Envoy 4.8L 1999-2006 compatible for GMC C, K 1500 Sierra Gen III LS1 Vortec 5.3L 1999-2006 compatible for GMC Yukon, Denali Gen III LS1 Vortec 5.3L 1999-2006 compatible for GMC C, K 2500 Sierra, Yukon Gen III LS1 Vortec 6.0 L Specification Reference OE Number : 10457730 12563293 19005218 8104577300 12573190 Quantity: One set with 8 pieces (as the picture show) Condition: New Warranty: one year warranty for any manufacturing defect Features- 10.5mm Spiral Wound Design - This plug wire kit adopt ultralow resistance Kevlar core - Direct replacment. No need to modify. - Solid construction - High-quality materials for high durability & long service life Notice- Please check the photos & description above carefully to make sure it is what you need. - No instruction included; Professional installation & alignment suggested. - Please check our store for other auto parts you may be interested in. - For any needs please contact us.