Having just completed this job for a second time in a year, I need to make two amendments:
1. You do need to drop the entire front belly panel -- so you can position the jack under the oil pan (Duh
)
2. A 2-inch extension is needed to access the mount's lower bolts through the frame.
The right/passenger-side mound was the one that was collapsed noticeable; the driver side less so.
This largely solved the vibration issue but I still can hear and feel some under certain conditions when stopped in gear; sometimes I feel and vibrations; sometimes there is just smoothness and dead silence.
This inconsistency would seem to rule out the mounts (unless the transmission mount, also replaced last year, needs attention. But I would doubt that -- and it was indeed an MB part purchased rom the dealer.
When I place my hand on the engine cover I can feel a vibration I never felt before, and I will address this in a new thread.