I am in complete agreement with Michael Oritt as regards side view mirror placement and usefulness.
For the first twenty-some years I had the Healey, I used flat-glass mirrors centered on the front wheel openings, and they gave all the field of view of adjacent lanes that I needed or desired.
Around the turn of the century, I renewed the mirror heads (stainless shells starting to look mottled) and opted for convex glass. With these mirrors, I can almost see the back of my head, and way more field of view than needed for city or highway driving (I think I get the idea behind those Wink mirrors).
One of the first things that a Performance Driving Instructor teaches their pupils is how to
correctly adjust their mirrors. You DO NOT need to see the edge of your own fender (if you don't know where your fenders are...). Once you learn how to set your fender mounted mirrors, they are very useful (MUCH MORE SO than the door mounted side-view mirrors on our M Rdstrs or Coupe).
As to the matter of the wing mirrors maintaining adjustment, GET THE #%$@ SPRINGBACK BOOMERANG MIRRORS that can't be
bumped out of adjustment! I fold my mirrors in 90* every time I put the car cover on it, and then snap them back into position for each next drive. I have not put a wrench on them (that locks the adjustment) since I put the new heads on 12 or 14 years ago. They stay where they are set , though I do keep a 9/16" flare-nut wrench in the bottom of the door for insurance (along with a screwdriver to prevent the Webers from needing adjustment; think about it).
These are the same stems/heads that were already fitted to my car when I bought it in 1978, so if you're losing your settings because
someone bumped into your car, your life could certainly be made simpler:
https://www.europaspares.com/exteri...mirror-stem-straight-st6-use-any-h6-head.html
Flat:
https://www.europaspares.com/exteri...rror-head/classic-round-mirror-head-flat.html
Convex:
https://www.europaspares.com/exteri...ic-mirror-head/classic-round-mirror-head.html
Two (2) mirrors and two (2) stems cost less than $72.00 (+ shipping).