This is the ROD seal to rebuild the hydraulic cylinders that locks your Vario retractable roof to the windshield, with a Multipage Illustrated Guideline a useful Pick tool for removing the old seal The U cup seal in the kit is an upgrade to the OEM seal, which is not capable of withstanding the aggressive/corrosive hydraulic fluids. The Enhanced Polyurethan compound used in this seal is exceptionally resistant to petroleum based oils, found in hydraulic fluids used in the Mercedes Benz convertible top hydraulic system. Fits the following vehicles built on the Mercedes R171 chassis: SLK200 Kompressor 2004 - 2008 SLK280 2005 - 2009 SLK300 2009 - 2011 SLK350 2004 - 2011 SLK55 AMG 2004 - 2011 A Comprehensive Multipage/Illustrated set of instructions are included. For repair of Mercedes Benz part numbers: 1718000072 Front Lock Cylinder) Additional Details ------------------------------ Package quantity: 1