Top-of-the-head, Dan, is that the bushed one had a hole too large. Yet it is early, and the "motor heads" will probably correct me.
Oh, and there is an AD on those bosses. NDT needed to detect cracks.
Used parts, the cylinder with the rock pin bushing is a chrome cylinder. The other is a steel cylinder and made for no bushing. So the bushing (#34) AR is a repair. Right ?
I know about the AD.
I have all the parts and overhaul manuals.