There are two methods:

1. Replace the entire back cover with a new one (use a new gasket). MB used to sell these back covers, but I think they are no longer available. You could try at the dealer. (Bosch) diesel workshops sometimes sell them.

2. Replace the bearings and O rings of the axle. The problem is to find a good (Bosch) diesel workshop who sells these parts.

So yes, but finding the part(s) can be difficult.

Maybe a metal workshop can make the bearings for you. Rubber O rings can be universal.