This is for the ROD PISTON SEALS to rebuild the hydraulic cylinders that raise, lower, and lock your retractable roof, with instructions. PLUS Free Hydraulic Pump Refill Instructions This comprehensive set of 30 plus O-rings is what you need to rebuild all 11 or 12 (depending on year of your car) roof hydraulic cylinders. Because of changes made during the R129 chassis' run, We have included all the possible combinations of o-rings needed--regardless of year or model 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 theconvertible top hydraulic system Fits the following vehicles built on the R129 chassis: 300SL 1989 - 1993 300SL-24 1990 - 1993 500SL 1990 - 1993 600SL 1993 - 1993 SL280 1993 - 2000 SL320 1994 - 2002 SL500 1994 - 2002 SL600 1994 - 2002 A set of basic instructions and links to online resources are included. For repair of part numbers: 129 800 0272 / 129 800 02 72 / 1298000272 (Main top drive actuators) 129 800 1672 / 129 800 16 72 / 1298001672 (Windshield top lock actuators) 129 800 2172 / 129 800 21 72 / 1298002172 (Rear top lock actuators) 129 800 2072 / 129 800 20 72 / 1298002072 (Tonneau actuators) 129 800 0072 / 129 800 00 72 / 1298000072 (Rear top lock actuators / tonneau lock actuators on some years) 129 800 1772 / 129 800 17 72 / 1298001772 (Left top-folding actuators) 129 800 1872 / 129 800 18 72 / 1298001872 (Right top-folding actuators) NOTE: THE SEALS IN THIS KIT ARE O-RING SEALS. Additional Details ------------------------------ Is autographed: false Is memorabilia: false Package quantity: 1