Ah, you want to swap an OM606 diesel engine into which
year W210 chassis?
Recall that the W210 was facelifted for the 2000 model
year. I recall reading that the OM606 would not fit
under the (lowered) hood of the facelifted W210 chassis.
That's one of the reasons we stopped receiving the E300
in the 2000 model year. So if I understand your question,
the answer is it cannot be done.