I think it's either or both of these:
rubber-mount (item 2, 3 and 4)
http://www.realoem.com/bmw/showparts...28&hg=33&fg=30

or
balljoint (item 2)
http://www.realoem.com/bmw/showparts...29&hg=33&fg=30

But no article on how to replace these.
I have the ZDMAK tools for balljoint (I think, I am not at home right now) just want to see if anybody done this work before.
Thanks.