I just looked at a couple of youtube videos, and I don't like any of the recommendations for pulling the front bearing. They do things like snap the outer race in a vice and use dremel tools to grind the inner race. That's the hard way to do it, and if you slip, you've ruined the shaft. The right way to do it is with a gear puller. There's an illustration on post 10 of this thread (it's a different Bosch alternator, but the architecture of the front bearing is the same):

964 alternator rebuild - Pelican Parts Technical BBS

He removes it correctly. If done this way, the bearing comes out in one piece and the plate isn't mangled.