Thanks Chuck, Naj and Dan for your input.
I found out yesterday that the bolts are not M6 6mm which are mentioned in another thread on this forum. That thread "Rear Wheel Bearing Tour" incorrectly states M6 bolts.
Today, I will pick up some M8 8mm bolts that have 13mm heads. Hopefully, this is the correct size? Or, maybe they are 7mm? I am guessing that I need an 8mm standard metric bolt to do the job.
I guess I have been working with SAE for to long. All this metric stuff is making me nuts.
Dan, you are correct as far as the split pins. The only things I see on the backing plate are two bolt heads that hold the wheel cylinder, and two large slotted bolts that must be the brake adjusters.
I would assume that if I were to release the wheel cylinder, back off the two large adjuster bolts and use some PB Blaster or what have you, I should be able to get this fool thing off.
Hopefully, I might get to it tonight if I get lucky.
Thanks again,
Tom L