Bilstein gas pressure shock absorbers are arguably the highest quality shock absorber and also the chosen brand for not only Mercedes, Porsche, but are found on vehicles from AMG,Lorinser,Brabus,Carlsson to name a few. Restore ride quality using the gas pressure B4 shock absorber which are equivalent to the factory units / part no 1133200031 . We have priced them each including Vat, but excluding carriage as we would always recommend changing them in pairs (per axle). UK mainland delivery adds £12 excluding Highlands and Islands. Original Bilstein part no B46-0539