Iv recently had to look up wheel locks as well and discovered that bmw provides two different kinds. One with Key's and Ones without. I have been told that the ones with keys are easily token off because there are only 5 different keys =/ and the key less ones are actually more worth it since they are more hidden. i am not sure about the parts number but the key less ones are usually 30 dollars. hope that small bit of info helps.

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2005 Black x5 3.0i