I went to the boat and took some measurements of the bearing. The dimensions I posted above look to be correct.
Still need to figure out the diameter of the shaft tube.
I tried to get the prop shaft off while there. As usual, it wasn't easy. In fact, I didn't get it off yet. The aft half of the prop coupling is rusted pretty well. I was able to get one of the two screws, which hold the prop shaft, out of the coupling. The other wouldn't budge. I soaked it in some WD-40. I'll let that soak in and then try again tomorrow night.
If feasible, it might be a good time to replace the rusted coupling. Anyone had that rear-half of the coupling replaced before? I'm definitely going to get new screws.
