To be able to remove the broken wheel stud you have to remove the
front hub (with bearing), and in doing so it destroys the bearing
sealing ring. MB will only sell you the complete front hub assembly
that consists of the hub+bearing/backplate/hub carrier..or item #10
as you state.
Do not try to get away with buying just one new stud and a new bearing,
buy the hub+bearing made by SKF (it has the studs already fitted).
You then need to find or know someone who has the necessary tool to
remove the original hub+bearing and fit the new one as it is not the sort
of thing you can do without the correct tool.
Ok, there are a few...very few....that have been done by some members,
but there is no actual 'Guide' as such...just a post with a video etc.
That is here :-
http://www.forfour.co.uk/forum/index.php?topic=5338.0