The spark plug wire set also called high tension leads transfer high voltage pulses to ignite the air and fuel mixture for a combustion in the engine. High performance wires can withstand extreme heat and voltages therefore enabling the engine to run at its maximum potential power consistently without dropping performance for long periods of time. This high performance spark plug wire set from AA Ignition has a flexible boot socket on both ends of the wire while providing the highest possible voltage spark for maximum performance, torque and horsepower without interfering radio frequency. ONLY COMPATIBLE WITH COILS #12558693 See compatibility chart below if you need the coil pack set as well. Compatible with the Following Vehicles: 2002-2006 Escalade, Escalade EXT 2003-2006 Escalade ESV 2002-2006 Avalanche 1500 2003-2006 Avalanche 2500 2001-2002 Express 3500 1999-2006 Silverado 1500 2007 Silverado 1500 Classic, 1500 HD Classic, 2500 HD Classic, 3500 Classic 2001-2006 Silverado 1500 HD, 2500 HD, 3500 1999-2004 Silverado 2500 2000-2006 Suburban 1500 & 2500, Tahoe 2003-2006 Savana 1500 2003-2007 Savana 2500 2001-2007 Savana 3500 1999-2006 Sierra 1500 2007 Sierra 1500 Classic, 1500 HD Classic, 2500 HD Classic, 3500 Classic 2001-2006 Sierra 1500 HD, 2500 HD, 3500 1999-2004 Sierra 2500 2000-2006 Yukon, Yukon XL 1500 & 2500 2003-2007 H2 2004-2005 FasTrackFT1061, 1461, 1601, 1801 2005 FasTrackFT1261 Replaces part number: 9748HH, 19351572, 89018056 7881 13557975 19299585 This is a compatible replacement part manufactured by AA Ignition. This high performance spark plug wire set is NOT a genuine OEM part. Vehicles and their associated vehicle models, engine and part numbers are only used in this listing to identify the vehicles this spark plug wire set fits.