5809. Left.W/AIR SUSPENSION. Right.W/AIR SUSPENSION. Upper seal. A circular disk covered in rubber or plastic with a hole in the center where the edge is sometimes tensioned by a spRing that prevents fluid from leaking at the Active Suspension Air SpRing. A component which prevents a leak or provides Sealing surface at the Suspension Shock Absorber Dust Cover. Part included in Shock assembly. Air Sp. RUBBER. Shock Absorber Bellows. Support. Included with: Protect sleeve, Shock assembly.