KYB AGX Shocks are direct replacements for the original shocks supplied on your Miata. Add the flexibility of 8-way (4-way on 99-00) adjustable damping rate to tune the vehicle's performance to meet the needs of the street, strip or track. The damping rate is selected with an external knob on the side of the shock body, no tools necessary. The KYB AGX shock absorber's single damping adjustment changes the shock's compression and rebound resistance at once. Shock sold individually.