Oddly enough looking at several old 66 bronco reviews and I didnt see any rearview mirrors in any of them. Could have been a option or a dealer item. Id be inclined to say both may be correct. They are fairly similar ford may have had a design change or The vendor they bought from had a design change.
Do they have any ford part numbers on them?
The second pic looks very close to the mirrors some scout 80's had.