This 8 Pack Sixity Ignition Coil is compatible with Mercury Grand Marquis 2011, 2010, 2009, 2008, 2007, 2006, 2005, 2004, 2003, 2002, 2001, 2000, 1999, 1998 4.6L V8 and is perfect for a tune up or performance upgrade. This ignition coil is compatible with DG508 curved boot. New curved boot ignition coils reduce misfire and hesitation. If you need straight boots, please search for part number DG511. Compatible with Ford vehicles using DG508 curved boot. Compatible with part number(s): 48688, DG467, DG472, DG473, DG481, DG491, DG508, DG540, GN10164, 673-6000, IC369, IC62, F523, 36-8013, 2505-34733, E262, E262P, 88921369, 1L2U-12029-AA, 1L2Z-12029-AA, 1L5Z-12029-AA, 3W7E-12A366-AA, 3W7Z-12029-AA, 3W7Z-12029-AAE, F7TZ-12029-CA, F7TZ-12029-CC, F7TZ-12A366-AB, 8W7Z-12029A, F7TU-12029-BA, F7TU-12A366-AB, F7TU-12A366-BA, F7TZ-12029-AB, F7TZ-12029-BA, IC369SB, FD503T, FD-503, FD503