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This air spring will provide you the same driving comfort you experienced on Day 1 with your GL-Class X164. It has the original design installed by Mercedes (part number A1643200725) with a rotating upper piston. .This air spring is no longer offered by Mercedes and has been replaced with a static upper piston version of the original. The original version’s rotating upper air spring piston was designed to switch off the torsion load, especially during OFF-ROAD trips. This functionality also provides the air spring a longer life span. The new air spring provided by Mercedes does not have these benefits, making the original version the best choice for replacing your air springs.. It is highly recommended by Mercedes that both air springs be replaced at the same time, ensuring that both air springs match the original vehicle specifications. .Can be installed in the following vehicles:Mercedes-Benz GL-Class X164 (2006-2012) GL 320 CDI 4MATIC / GL 350 CDI 4MATIC > Chassis: C164822GL 320 CDI / GL 350 BlueTEC 4MATIC > Chassis: C164825GL 420 CDI 4MATIC / GL 450 CDI 4MATIC > Chassis: C164828GL 450 4MATIC > Chassis: C164871GL 500 4 MATIC / GL 550 4MATIC USA/JAPAN > Chassis: C164886.Original spare part number:A 164 320 07 25 ; 1643200725Successor spare part numbers:A 166 320 03 25, 1663200325, A 164 320 10 25, 1643201025Reference: A-2596.Scope of delivery:Air spring rearLocking clip A2113200058; 2113200058Rubber plate .Important: - Never lower the vehicle with unfilled air springs!- Check the air spring system for leaks.- Completely lower the vehicle from the lift.- Make sure after repair that the system is absolutely leakproof. The easiest way to determine this is by parking the vehicle. Wait for the automatic readjustment of the system if your vehicle has this function. Measure all heights air supported and record from the ground to the lower edge of the mudguard. Check at the next day and compare these heights. Even a small deviation of the distances leads to permanent damage to the compressor and the valves..Your advantage:- Original equipment quality- Quality assurance by us as a German company- Much cheaper than authorized repair- Personal advice- We as German provider have the European returns policy- We also have a 2 years warranty- Worldwide express delivery is our standard- In Europe we have the longest experience with the topic of air suspension for automobiles in the after market.