Mirrors were almost always installed by the dealers, whereever they felt they looked good.
Personally, I like the wing mirrors on my TR3 for both form and function. My neck is kind of stiff (from an old car accident) and the wing mirrors (with convex lenses) pretty much eliminate any blind spot from not being able to look over my shoulder. They're also handy when trying to pull out from a line of parked cars (when the view from a door mirror would be blocked by that Expedition that parked almost touching your bumper).
Also, the driver's door mirror on both Stags won't pivot far enough to suit me. I don't care where my rear fender is, I want to see what's in my blind spot.