[Compatible with Ford and Lincoln and Mercury]: 2005-2008 Ford Expedition 5.4L V8; 2006-2008 Ford Explorer 4.6L V8; 2007-2008 Ford Explorer Sport Trac 4.6L V8; 2004-2008 Ford F-150 5.4L V8; 2005-2008 Ford F-250 Super Duty 5.4L V8; 2005-2008 Ford F-250 Super Duty 6.8L V10; 2005-2008 Ford F-350 Super Duty 5.4L V8; 2005-2008 Ford F-350 Super Duty 6.8L V10; 2005-2007 Ford F-450 Super Duty 6.8L V10; 2005-2007 Ford F-550 Super Duty 6.8L V10; 2005-2008 Ford Mustang 4.6L V8; 2006-2008 Lincoln Mark LT 5.4L V8; 2005-2008 Lincoln Navigator 5.4L V8; 2006-2008 Mercury Mountaineer 4.6L V8 [Compatible with OEM Numbers]: Ignition Coil: DG511, DG-511, C1541, 5C1584, C1659, UF537, UF-537, FD508, 3L3Z12029BA-3L3E12A366CA, 3L3Z12029BA-3L3U12A366BB; Spark Plug: SP546, SP-546, PZK14F [Package Includes]: 8 * Ignition Coils DG511; 8 * Spark Plugs SP515/SP546. Simultaneous replacement of ignition coils and spark plugs is recommended to reduce the likelihood of common ignition system failures Eliminate misfires and provide maximum voltage. Reliable under extreme conditions. Perfect replacement for your failing or broken ignition coils. 100% Compatible with OEM parts, meets original equipment manufacturer (OEM) standards [Note]: Please use the year/make/model drop down bar and interchangeable part numbers to confirm compatibility. Please check if your boots are curved or straight. DG511 is Straight Boots