Things like these you are just better off stopping by at a dealer (if there is one close by) and picking it up from them. I bought a couple of these from the dealer for about $2 each. I took them off and kept them safely in a plastic cup so I don't lose them... then dumped the plastic cup and couldn't find them ever again ... I had to go to dealer and get some. I used some tie-wraps to keep things in place while I drove to the dealer and could have just left the tie-wraps in there I guess.

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Currently driving: 2011 E70 x35i , 2011 E90 335d
Previous BMWs: 2007 E90 328i , 2005 E53 3.0i, 2011 F10 535i (6spd manual)