Geoff,
The type you are referring to have a "U" section with two small screws that thread through tapped holes in one side of the "U". One slides the "U" over the door window frame and tightens the two screws. Horrible!! The screws of course bite into the chrome. I'm thinking it would be better to mount wing mirrors. They need a hole in the wing of course, but at least the holes can be rustproofed before the mirrors are installed. I've got wing mirrors on my Healey 100 and most cars of that era would have had mirrors on the wings, not the doors.
Just my opinion FWIW.
Mike
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