Set of 8 Heavy Duty Ignition Coil Dg508 and Set of 8 Motorcraft Spark Plug Sp479 The Coil boot is Treated with Dielectric Grease to avoid boot fusing and voltage leak, The coil spring is stainless steel DG-508 3W7Z12029AA SP-479 AGSF22WM COP9 FD503 DG467 DG473 DG-508 DG491 F523 FD493 C566 5C1412 FD503T GN10164 1L2U12029AA 1L2U12A366A