Carbole 8 Pack DG508 Ignition Coil Pack High Performance Coil Pack More 15% Energy Curved Boot Ignition Coils for Ford Lincoln Mercury 4.6L 5.4L 6.4L V8 Fits Part#DG508 DG457 DG472 DG491 DG540 FD503 D INCREASED 15% POWER: DG508 ignition coils designed high quality copper,replacement coil more durable and reliable than original stock coil under extreme conditions while providing High Electrical Resistance,strong Spark from plugs,and being resistant to Corrosion and Abrasion. COMPATIBLE OEM PART NUMBER: Compatible to DG508 DG457 DG472 DG491 DG540 FD503 DG467 DG473 DG481 E213 E262 E409 IC369 F523 5C1412 GN10164 FD79 13062237 1972290 1L2U12029AA 1L2U12A366AA F7TU12A366AB F7TU12A366BA F7TU12A366CC F7TU12A3 F7TZ-1029CC FZTZ-12029CA 21941485 21941505 3W7Z12029AA 71HM12300AA 52-1761 PERFECT UPGRADE: Replacement ignition coils are designed to be easy to install,Better acceleration a smoother idle and Improved fuel mileage.NOTE:When replacing the ignition coil and the spark plug,it is best to cold the car to prevent the sliding wire caused by thermal expansion and contraction. FORD OWNERS:New ignition coil is DG508 curved boot,if your stock coils is Straight.You need Straight Boots,Part number DG511 with B01CG2N0VA. Width Fitment :Ignition coil pack suitable for Ford 4.6l 5.4l 6.8l v8,Lincoln and Mercury vehicles including Crown Victoria,E-150,E-250,E-350, E-450,E-550,Econoline,Excursion,Expedition,Explorer,F-150,F-250,F-350. Please check description before you BUY IT as the part can change based on the year/ month of manufacture of your vehicle.