I thought the discussion was about storing sunglasses.
If that's the case then my option stands. Put them in
a case. Then put them in the side pocket drivers side.
Now what's wrong with that? No need for a holder..........

__________________
"What you hear in a great jazz band is the sound of democracy. “The jazz band works best when participation is shaped by intelligent communication.”
Harmony happens whenever different parts get to form a whole by means of congruity, concord, symetry, consistency, conformity, correspondence, agreement, accord, unity, consonance…….