For anyone looking for a supplier/manf. of trailer hitches there is an outfit called Rigid Hitch Inc. in Burnsville, MN
They make many foreign hitches and for MB do:
C class, 94-98
S class, 81-91, 92-99
E class, 94-95, 96-98 exc wagons
300D, E, CE, 86-93 exc. wagon
300TD, 300TE, 79-95
ML 98-99 to 5,000lb.
Hope this helps and you can ask about mounting points.
300SE, 300CE, 190/5.0