MSD Ford DIS Coil Pack - 4-Tower HASZ20POLAR These hardened steel balls are

These hardened steel balls are inserted into the stud holes before the cover studs are threaded in to keep the studs from galling the housing and help disperse any stress created when installing the cover studs

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MSD Ford DIS Coil Pack - 4-Tower HASZ20POLAR These hardened steel balls areMSD Ford DIS Coil Pack 8241 4 Tower Stock Bolt On Direct Connection Improved Materials And Windings Produce A Stronger Output Smooth Idle Improved Mid Range RPM Power Connect To Factory Wiring This MSD Ford4 Tower Coil is designed as a replacement coil and produces a high voltage spark. To get even more ignition performance, install an MSD DIS Series Ignition Control. Note: If the Coil Pack is being installed on a '99 '04 Ford Focus Zetec, the spark