I just did this on my car. If I am understanding you correctly and we are talking about the same bracket, it bolts onto the alternator itself. Here is a picture I took while I was doing my job. There are several prongs on the bracket that slot into and around the alternator to keep the bracket from moving. In my picture, the bracket is loose and coming off the alternator but it should give you an idea of where it goes and in what orientation.

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2007 E70 X5 4.8i Sport Package
8x,xxx Miles
"My Precious" (Smeagol voice)