I have already acquired the O-rings listed above. Without splitting the calipers I don't know how I would have been able to clean the bores. I worked on them yesterday for an hour with a small wire brush. It is obvious that there was moisture in them that settled in the low spots. They look better but I am considering hitting them with a light hone.
@RSS1 Do you know the torque spec fro the caliper bolts that hold the halves together?
Steve