What type of nut is it?
that tightens the bearing on W124 chassies?
Is it the same type as the one found on the wheelhub on W123 chassies?
You know the one with four sprockets that require a special socket to be used?
If it is I'm in luck cause I have my homemade socket hidden in the garage somewhere since the good ole days of a -80 300TDT.
MB E300TDT -98