SL/R129: SL600R129
This link, https://mbworld.org/forums/sl-class-...der-sl500.html , should take you to an existing thread where this topic and the names/contact info for the rebuilders (I favor Dennis Ficken, but make your own determination) the cylinders can be rebuilt for around $50@, + shipping, warranteed for 3 years, etc.
Should the link not work, use the search tool found at the top, right-center of this page in the gray bar. Select 'Advanced Search' and type in the words, 'Hydraulic Cylinder'. The tool will display all that has been written about this topic. Read down the right side for posts in the '129' forum to save some time.
Good luck with this, and post any questions or feedback; lots of folks here can help you with this one.
Bob


