This is for the steering gearbox on my 92 500SL.

It is leaking from an o-ring on the TOP of the gearbox.

According to my shop, this o-ring is NOT included in an overhaul kit for the gearbox. (Perhaps there are other sources for the kit...)

Looking up the part in the MB parts resource yields an incorrect size...

It appears to be about 28mm inside diameter with a thickness of 2mm.
The material would probably be Viton or Nitrile rubber.

Does anyone have a source for this, or can they provide the correct part number?

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02 S500
92 500SL
92 400E (Sold)
87 300E (Sold)
83 300D Turbo (Sold)
75 300D (Sold)
74 240D (Sold after 20 years)