Yea, you will need to take off your alternator again, and your approach will be from the bottom. There are two bolts holding it in place. I suggest you replace those O-rings while you are there.

And 2 of number 3 here.
RealOEM.com - Online BMW Parts Catalog

It is not as bad as doing the alternator housing bracket, so you won't have to remove the diff or anything like that. Access will be a bitch though.

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