I believe that the difference between the Euro manifold mentioned, and the manifold on the OM603.971 in the W140 diesel is the bung on the Euro, is drilled and machined for EGR.

If this is correct, then all of the parts you seek are available on the '92-?? W140 diesels (300SD et al). Find one being parted, or order parts for the W140. I do not know if they're NLA or not.

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Gone to the dark side

- Jeff