'82 500SEL Euro w/ self-levelling susp., kit source for "shock" rebuild

[BenzRepair]

Have a customer with a Euro 500SEL with the typical leaks associated with self-levelling suspension. Needs a new hydraulic shock, and used to have a source for a rebuild kit for these shocks, but cannot seem to find it. Does anyone know of a rebuild source for these shocks or an available kit? Checked Hemings and came up empty. Thanks

As posted previously, there is a levelling valve rebuild kit from the dealer (W123 rear application -- did not check compatibility w/ other valves): MB# 000-586-00-32. Will post others as I find them.