I guess I have to do all the work for you????
Alternator 180 Amp 3 0L N52 7560985 BMW x5 E70 128i 328i 528i x3 2007 13 | eBay
This appears to be a 3.0l alternator by the description, but I have no idea if the secondary pulley can be removed and/or if the alternator mounting points are the same as the 4.8l.
But what I see on this ebay listing is the alternator has a one way over running clutch (or aka as a AOP) as well which is not what my 4.8l has. The AOP clutch may be a different size and different location.
My recommendation is DO NOT get an alternator from the local auto parts store.