I wanted to add a little more to the thread. I am replacing both sets of bearings. I measured the bearing and bought a tube so that i could pound it onto the flange as per the instructions in the Mercedes manual. I took one flange and put the tube on it and pounded away. I got it seated, but every time I whacked it I kept worrying that the tube might move and I would wreck the bearing. Plus, I was banging on it pretty hard and was wondering how in the world I was going to hammer the ineer bearing onto the flange while someone tried to hold the flange in place.
I decided to make a press that would work like the factory tool that I would use to press on the second outer bearing and that I could use on the car for the inner bearing.
Here is what I came up with. It works really well and I highly recommend putting together something like this. I only did the other outer bearing, but expect the inner bearing to work just as well. The tube I am using is too long for the inner, so I am going to cut it shorter before I do the inners.