Mike, good question to ask. Yes, it surfaced after the mounts were replaced. All 3 mounts were MB original replacement parts.
The work I did it myself. I am wandering how could I mess-up - the replacement of engine mounts is very simple - the mounts self align into their location after which I tied-up the bolts. I replaced them at 71K miles. Now about 7K miles later I have this vibration issue.