I just received my Lemforder transmission mount. Just like the LCA bushings, this part had the MB logo ground off (along with some of the part numbers). So this IS the factory part, just purchased through the aftermarket system.
BTW the part number for my mount is 123 240 2518 if anyone searches for the part number in the future.

__________________
84 300DT Puke Yellow. Totalled after 438,000
84 300DT Orient Red. 169,000 (actual mileage may vary)
2002 Explorer EB (wife's)