1. FitmentSet of 8 ignition coil compatible with Cadillac Chevrolet GMC Hummer 2002 2006 Escalade 2002 2006 Avalanche 1500 2003 2006 Avalanche 2500 2003 2006 Express 1500 2003 2005 Express 2500 2003 2004 Express 3500 1999 2006 Silverado 1500 1999 2007 Silverado 2500 2001 2007 Silverado 3500 2003 2004 Sonora 2000 2006 Suburban 1500 2000 2006 Suburban 2500 2000 2006 Tahoe 2003 2004 Trailblazer 2003 2005 Savana 1500/2500/3500 1999 2007 Sierra 1500/2500 2001 2007 Sierra 3500 2000 2006 Yukon/XL 1500/XL 2500 2. Compatible Part NumbersCoil packs compatible to C1208, D581, 5C1083, E226, 52 1618, IC400, 12558693, H6T55171ZC, UF 271 3. All of the ignition coils are built to achieve or exceed OE specifications, subject to strict quality control testing, the possible performance and dependability 4. Coils FeaturesThe ignition coils are easy to install, installed with the original chip to enhance the heat resistance, wear resistance and corrosion resistance of each coil. Thereby reducing the common problems of ignition coil misfire, long starting time, poor fuel economy, insufficient power, etc