maxpeedingrods Air Spring to Coil Spring Conversion Kits compatible for Jaguar XJ8 Series 04-10 C2C413491. Adjustable Damping & Height Unique 24 levels of damping adjustments ensure the stability of damping performance under various conditions 2. High Quality Components Camber plates and Collars are made from 6061 T6 Billet Aluminum to increase hardness 3. Hi Tensile Performance Spring Under 600,000 times continuously test, the spring distortion is less than 0. 04%. With the special surface treatment, the spring durability and performance are highly