I have the budget variety on all three of our cars...
Smaller convex disc on driver side, larger disc on pass side.
Not elegant, but the originals are 13+, 12+, and 5+ yrs old, depending on the car, and all work well.
Couple bucks at the auto parts store.
Back in the day when I worked, I used to buy a box of them, and carry a pair in my briefcase for when I had to rent a car, when travelling without the local guy.
GL, mD