The step-by-step instructions are now in full colors!Got a leak in the hydraulic actuator that locks your Mercedes’ roof to the windshield (the one above the headliner)? Here is the kit you need to rebuild it once and for all. We are the originators of this repair method--and have been helping people quickly， easily， affordably repair their leaking roof actuators since 2007. The specially designed o-ring in this kit is composed of Nitrile rubber， which is impervious to the Mercedes hydraulic fluid--unlike the OEM parts and competitors parts. This repair should last a lifetime. Yes， this project IS easy enough for DIYers. Just ask any of our THOUSANDS of satisfied customers. In a recent customer-satisfaction survey， 100 percent of responding customers indicated that this project was simple to do， the manual was easy to understand， and that many years later the o-rings are still working perfectly. This kit is for the top-locking actuator (above the headliner) for the following vehicles built on the Mercedes R230 chassis: 2003-2011 Mercedes-Benz SL350 2001-2011 Mercedes-Benz SL500 2006-2011 Mercedes-Benz SL550 2003-2011 Mercedes-Benz SL600 2008-2011 Mercedes-Benz SL280 2009-2011 Mercedes-Benz SL300 2002-2011 AMG SL55 2004-2011 AMG SL65 2008-2011 AMG SL63 Kit includes one Nitrile o-ring， which replaces the defective factory polyurethane u-cup seal， a 7-page set of illustrated instructions， and a handy set of four picks for disassembling the actuators. For repair of Mercedes Benz part number: 170 800 0072 / 170 800 00 72 / 1708000072 (Front lock to windshield) Please see our other auctions for a special tool for refilling your hydraulic pump once youve rebuilt your leaking actuators. Ebay item number 281845404099. (Indicated for the R129 chassis， but will also work with the R230 chassis.) We ship quickly (daily) and stand behind our products with a 100% money-back guarantee if you are not completely satisfied. Highly competitive shipping， too. (We ship by USPS--and will provide you a tracking number.) Thank you for considering our products and thank you in advance for your order，