This is for the ROD seals to rebuild the 5 hydraulic cylinders that raise, lower, and lock your retractable roof, with multi-page guideline, PLUS a Free Hydraulic Pump Refill Kit With Instructions This set of 5 O-rings is what you need to rebuild all 5 of your car roof's hydraulic cylinders. The o-rings in the kit are organized by cylinder, so you know which ones go to which cylinders. This is an upgrade to the OEM seal, which is not capable of withstanding the aggressive/corrosive hydraulic fluids. The Nitrile Rubber 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 R170 chassis: SLK200 1997 - 2004 SLK200K 1997 - 2004 SLK230K 1996 - 2004 SLK320 2001 - 2004 SLK32 AMG 2001 - 2004 Item includes 5 Nitrile 70 rubber O-rings, a tool for removal of the old O-rings and a Multi-page illustrated guideline. For repair of Mercedes Benz part numbers: FRONT LOCK CYLINDER 1708000072 RIGHT ROOF MAIN LIFT CYLINDER 1708000672 LEFT ROOF MAIN LIFT CYLINDER 1708000572 RIGHT TRUNK LID FRAME CYLINDER 1708000272 LEFT TRUNK LID FRAME CYLINDER 1708000372 NOTE: THE SEALS IN THIS KIT ARE O-RING SEALS. Additional Details ------------------------------ Package quantity: 1