The SLS shocks on my 123 wagon are leaking severely (520K, bumpy roads, and heavy loads). I ordered a re-seal kit on eBay. Apparently, it has the required o-rings to rebuild the shocks. I know Mercedes says the shocks are not re-buildable, but I figure it is worth a try. The eBay seller has some directions, but they seem pretty vague. Has anyone out there successfully rebuilt these shocks? It would be helpful to have directions and advice, beyond what the eBay seller has before I get started.

Thanks in advance.

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1980 300TD with 1985 300TD Turbo motor and 240D 4 speed.