I have the BMW part # 8413 8 361 643 and it's attachment bracket 8413 6 902 490. The BlueBus installation video on the M5Board shows this as useful in installing the BlueBus in an E39, maybe others, as well. It does not fit my E46 vert, and maybe someone else can use it. I paid about $30.00 for both, so make an offer that's more than the shipping if you can use these parts.