The black plastic fender flares on a 2011 are the same as 2010.
This thread discusses the parts...part #51770421056. $304 at getbmwparts.com. Price has gone up a lot since I got mine in late 2008 for around $120. BMW apparently started jacking up the prices on these when they noticed all the demand.
http://www.xoutpost.com/bmw-sav-foru...rs-needed.html
And this thread shows the plastic rivet gun you will need (the one with the green handle that I posted, if you don't want to remove the wheels for the flare install).
http://www.xoutpost.com/bmw-sav-foru...-retrofit.html
Good luck.
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