Thanks for the replies. I found a junkyard a few towns over that's supposed to have 2 point mirror mounts, so I should be able to find OEM versions.
My current mirrors aren't powered, and I don't want to have to install and remove towing mirrors when traveling multiple times, so I was planning on going with gooseneck mirror heads on those 2 point mounts like in the attached photo, or using the Extend-A-Mirror Arms like in the photo above.
Somebody seemed to be saying that the gooseneck mirror heads on the 2 point mounts shook too much to be useful at highway speeds. Does anybody have any input on that?
Also, do I just need a Torx driver set to remove the 2 point mirror mounts at the junkyard?