I have traced a fairly significant oil leak to the rear of the IP coming from the idle speed solenoid. I'm wondering if it's an o ring or gasket used to seal the solenoid. Not a whole lot posted about this.

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92 e300d2.5t
01 e320
05 cdi
85 chev c10

I don't know the answer but some of the part sellers use the Mercedes exploded views of parts and you might get an idea from the exploded diagram and if there is a part number you could do a image.google.com Search and you might see an actual picture of the part.

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84 300D, 82 Volvo 244Gl Diesel