NEW LifeTime Warranty DG511 FD508 5C1584 C1541 FD503 Set of 8 Ignition Coil on Plug Pack For Ford Lincoln Mercury V8 5.4L 4.6L, 3L3Z12029BA 3L3E12A366CA, 3L3Z12029BA 3L3U12A366BB Ignition coils are designed and endurance tested to resist the common stresses that cause failure Please check the description or use the year/make/model drop down bar and interchangeable part numbers to confirm the compatibility before purchase Computer tested for consistent Quality and unsurpassed reliability High Quality Copper Inserts Compatible with OEM numbers: 5C1584, E508, 52-1839, IC558, 3L3E-12A366-CA, 3L3Z-12029-BA, DG 511, FD-508, UF-537