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The nut on the back of the alternator housing that the long bolt goes through is actually a steel sleeve in the aluminum housing.

When the bolt is tightened, the sleeve pinches and makes it really...

Forgot to post last night.

I can confirm it is 27mm

I'm pretty sure I use a 27mm crow foot on these. I can check tonight to be sure

The problem with getting them in/out is pretty universal with all the Audi platforms. The rear of the alternator where the long bolt threads in is a sleeve that ends up getting pulled towards the...