Air spring bolt. Left.W/AIR SPRING. Right.W/AIR SPRING. Upper. A threaded rod with a drive head (such as hex, 12 point, torx, etc) on one end used to secure the Active Suspension Air Spring to it's mounting point. A threaded rod with a drive head (such as hex, 12 point, torx, etc.) on one end used to secure the Suspension Coil Spring Retainer to it's mounting point. Coil Retainer. Hexagon with wa. Mount. Shock. Suspension. Thrust ring.