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These endlinks are intended for street and autocross applications and are highly recommended for use with the Racing Beat bar. Although these upgraded Mazda3 endlinks can be used with the stock sway bar, we believe that the original links are adequately suited for use with the stock bar.
Due to the larger diameter studs provided on the Racing Beat Mazda3 endlinks, both the sway bar ends and the holes on the shock mounting flange must be enlarged to accept the endlink mounting studs. Provided in the endlink kit is the appropriate sized drill bit and a drilling guide to accomplish this task. Also included are detailed instructions complete with drilling suggestions and torque specifications for your Mazda3.
Note: The reason that the RB Mazda3 sway bar is provided with a 10mm hole is to allow use of the stock OEM endlinks. If supplied with a larger 12mm hole, then it would become mandatory to use the aftermarket links. Although the use of the RB Endlink Kit requires minor modifications, the rather cheap "insurance" offered by the installation of this kit is well worth the modest installation effort.