Chassis reinforcement plates made by Murakami Motors of Japan. These plates were made as part of a collaboration with Nagisa Auto and were designed to help stiffen up the chassis of your ND Miata! These plates connect the shock upper mount to the bulkhead in order to tighten up the car and improve handling. They install easily and will create a noticeable difference in the feel of the car. Plates come in the color black, please inquire if you’d like yours in a different color. Murakami Motors Reinforcement Plates should be ordered at REV9 Autosport https://us.rev9autosport.com/murakami-motors-reinforcement-plates.html as they provide the best service and speed we've seen so far!