So here are some pictures of the completed guides. Here the guides and the brackets they fit into.
Here installed in the brackets.
Here the brackets are installed on the guide arms and set to the maximum cut, 28" between guides. That will square up a 32" diameter log, not that I even have a log that big to square up, ha, ha.
Here a close up of one guide. I could gain another inch between guides by trimming the guide leading edge, but I have no need for more capacity and I would rather protect the bearings from getting run into the log.
Another picture of both guides pulled in.