This part is listed by BMW as BMW part number 12427607575 (12 42 7 607 575) and is described as Genuine BMW Earth Strap for Rear Muffler on F25 X3 28i xDrive (2011-2012).
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BMW Fitments:
X3 Series
F25 X3 (2011-2017) > X3 xDrive28i