Original door bushing (dove tail/cups) designed by KenAuto in Japan. This is the thickest possible size and most effective door bushing on the market used by thousands on Japanese Roadsters in the circuit. This piece is a replacement for the stock part that the door sits on when closed. By replacing the brittle stock unit, you’ll notice more steering response and less suspension wiggle. This piece will do a great job of stiffening up your Miata. Installs in minutes and creates a noticeable difference in drivability. Some of the JDM shops such as Joyfast & TUCKIN99 had very high praise for the part and use them on all their race cars now! Learn More