How to Change the Spark Plugs on your 3 Mustang – A Here are the Motorcraft SP-520 3 V6 Mustang Spark Plugs in the box. Alternate part number CYFS-12F-5. These were gapped over from the factory. Nick the tuner at ProCharger recommended I gap them from to (because of the blower) Pull your engine cover if you have one. Also your strut tower bar if you have one of those also. Mustang Spark Plug Wire Holder Set (86-93) E6ZZ-12297-SET Spark Plug Wire Holder Set Get your engine bay looking neat and organized with these exact reproduction, 1986-1993 Mustang spark plug wire holder kit from 5.0 Resto! These are the factory style spark plug wire holders that mount to the valve cover studs on your engine!