Your repro mirrors appear design-consistent with the original mirrors on the two cars I pictured, but the mounted location on the one you pictured is VERY MUCH more forward than the original factory position. Based on my limited sample size (Nomads and Sedans), it seems that all the mirrors were mounted in the same location (on the driver's side) - Trifives were not outfitted with RH mirrors from the factory!).
Perhaps a RH mirror with a convex surface (would widen the field) and alleviate the issue I raised in my previous post...
I was wrong about having an NOS mirror in the box. I looked yesterday and couldn't find one. I had a box 'hand labeled' 57 NOS mirror, but once I opened it, it was clearly NOT a TriFive mirror... I don't even know how long I have had it or where I got it..
The original mirrors on the two cars I pictured seem to have thin rubber gaskets between the mirror and door (which are deteriorated) and I seem to remember from installing an NOS one long ago that the thin gaskets were difficult to keep positioned when installing the mirror, so in that sense, the plastic 'gasket' is probably better even if not original.