I am in the same spot as you. I recently had the headliner recovered and left the visor off.
Not wanting to have something there, asked the guy to leave the holes covered, but alas, he did not. So, I have two holes gaping.
I had thought about having 2 circular pieces of aluminum cut and mount them with countersunk screws. Then take some black vinyl, as I have a black roof now, to cover the screws.
Just haven't gotten around to cutting and finishing the alum yet.
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How about getting a small custom plate made at a sign or trophy shop. Put anything on it like....Made for, ouch, car name, list of tracks the car has run on....something relevant to your life and times. I may not come up with the best ideas but I thinking all the time!
Kent