I had one done for about $100 on my 240 D a couple of years ago by an independent. I checked on Fastlane and they have the motor mounts for $28/each and the transmission mount for $25. Doing all three or just the two motor would not add to the labor too much. No other parts are required - it's a simple job.

Good luck.

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1976 240D
1987 560SL
2007 E320 Bluetec
1998 C280 (now son’s car)
1982 240D Manual - Sold