Part Nr:
51 77 7 161 743 (left)
51 77 7 161 744 (right)

You will also need to buy a few expanding rivets, since it's likely you'll mutilate the old ones getting them out.

07 11 9 905 507

I replaced a similar part for the rear wheels in my X3 when they simply became torn/ragged/hanging on by a thread after years of use. Expect them to cost around $10-14 each.