Hi Roland,
I finally got to see what it is you are looking for. What you need, of course, is available from Joe Alexander as he indicates he has plenty so that should be your first choice.
If you are trying to replace it, however, what you are looking for would best be described as a "metric angled flare to hose fitting". Since one end has a hose with hose clamp on it, that makes it a hose fitting. When you see the part that it screws onto on your photo, that makes it a flare. When you consider it to be German, that makes it Metric. And of course, the 90 degree angle...
If you go to your browser search bar and type in "Metric Hydraulic Fittings" a number of companies will pop up. Alternatively if you take both photos--mine with the part attached, yours with the part removed, and go to a local hydraulic specialist they might be able to identify or locate a supplier outside of the Mercedes-Benz parts world.
When I make any company recommendations or suggestions, my posts are generally removed thus I can only speak in generalities I'm afraid.
