Quick Overview Bilstein B6 4600 (Shock Absorber Conversion Kit) are specifically designed to eliminate rear original equipment Nivomat load leveling shock absorbers. Removing the Nivomat damper causes a significant reduction in rear spring rate. The B6 4600 (Shock Conversion Kit) includes (2) springs which will restore factory ride height. The kit includes (2) B6 4600 monotube shock absorbers which will provide a significant improvement in ride quality, handling, and comfort. B6 4600 shock absorbers utilize a unique, velocity sensitive, digressive piston which reacts to changing road conditions. The B6 4600 (Shock Absorber Conversion Kit) will offer a performance replacement for an OE Nivomat suspension systems. Attributes: GTIN: 00651860804392 Brand Name: Bilstein Upper Mount Type: N/A Series: B6 4600 Reservoir: No Finish: Yellow Paint Adjustable Damping: Non-Adjustable Body Design: Smooth Body (Non-Coilover) Internal Design: Monotube Body Diameter (ID): 46mm Boot Included: Blue Straight Extended Information: Country of Origin: United States Emissions : Released Life Cycle Status: Available To Order Packing Information: Quantity of Each: 1.0 Package UOM: EA Dimension: 22.2500 x 27.3700 x 7.0000 inches Weight: 33.9000 lb PDF: USA SDS_Shock_Air Spring_V2_EN Generic_instructions_02