ApplicationCompatible for Audi A6 C51999-2006 compatible for Audi A6 4B2, C5 1997-2005 compatible for Audi Allroad Quattro Wagon (C5) 2001-2005SpecificationOEM Part Number: 4Z7616051B 4Z7616051D 4Z7 616 051 B 4Z7 616 051 D Feature: - one year warranty for any manufacturing defect - Mates with OE Air Lines - Designed for Comfort Suspension and high quality - Fast Shipping - Replaces the original spring - Safe carrying capacity and stability - High-quality materials according to OE specifications, for high load capacity and long service lifeNote* Please confirm your old part number matches up with one of the part numbers above * Professional installation is highly recommended (No Instruction Included) * For any needs please contact us