My '31 deluxe roadster when new came only with a driver side rear view mirror.
Like every open "A" driver I also run a rear view mirror. Located on the middle top of the windshield frame. But, I do it one better with an original era accessory "dual" rear view mirror bracket. With those babies I never have to turn and look back behind me except when backing the car up!
I found the dual mirror bracket on
greedBay some years ago.
Bob-A