The 1990-97 Miata was designed by Mazda with "U" shaped end link attachment brackets on the front lower control arms. This "double-sheave" attachment provided a secure and rigid mounting technique for the sway bar end links. When the 1999 Miata was introduced we noticed that Mazda had changed this front attachment point by reducing the attachment bracket to a single-sided "L" shaped. Our observations led us to believe that this "L" shaped design might not be strong enough to handle the demands of a stronger aftermarket sway bar. We strongly recommended the addition of these front Lower Control Arm Reinforcement Flanges. This modification will convert the "L" shaped bracket into a "U" shaped bracket, and while this modification requires some minor welding, we believe this effort is worthwhile. After completion of this modification, the stock end links can no longer be used. Sold as a pair, this kit modifies both front lower control arms. If these flanges are added to the lower control arm attachment bracket, then the Racing Beat Heavy Duty Sway Bar End Link Kit MUST be used. We also recommend the use of the Racing Beat Sway Bar Brace Kit with the use of any aftermarket sway bar.