Thanks Don!
I had been told that the mirror was a break-away type, but did not know if it would be difficult to re-secure or if that is what I need to take off in order to put the middle visor in.
The middle visor has a few small male ends that appear to fit into slots, so it may be that they fit up under the mirror.
If you have time to look at yours, I'd appreciate any feedback you might offer.
Thanks again for your time and detailed mirror photo.