On the doors where the front-most mirror leg goes, there isn't enough depth to put in a nutsert without bottoming out on the inner door metal which ends up being right in the door hinge hollow. The only way I see is to drill the hole all the way through, insert the nutsert, then close the inside hole.
Anybody got a better way?
Wish I knew where my old truck is, I'd take a picture.
I had the mirror on that Ford that had a top and bottom mount with a flat metal bow that went from one to the other.
Mirror mounted on the bow.
Vine ripped the nutserts out of the top mount.
Took a flat piece of steel, longer than the width between the holes. Drilled and tapped two holes where the nutserts were.
Then drilled and tapped a smaller hole inbetween with a matching hole in the door.
Used my Dremal tool to cut a slot in the outside door panel below the two original holes, but still covered by the mirror mount.
Eased the piece of metal in the slot until I lined up one of the original holes.
Put a bolt in to hold it, then swung the piece up until the other two holes lined up.
Put the third, new small bolt in, with a countersunk head. Tightened it well. It held the plate in place while I took out the original mirror bolts.
Then I put the mirror mount back on, threading the original bolts through the mount and into the plate.
The new bolt and the slot I cut were both covered by the mirror mount.
It all looks factory from the outside.