My dad, in 1963, had a set of these he used on his Pontiac Station Wagon that towed his 18 foot travel trailer. Although, they were an older version of these:

When I started towing, my mother gave me my Dad's old mirrors and I used them for several years on several vehicles.
Then, 2 trucks ago, it had electric expanding out mirrors, and my next truck had manual expanding out mirrors and my current truck has manual expanding mirrors, so I don't need to use the clip on type shown above.
But, if you are looking for a universal mirror that works very well, and can be removed easily when not needed, these are still tops.
They catch under the hood of your tow vehicle and then the other half catches under your fender wheel well. Then you tighten them down with a turnbuckle. Of course, it takes a little brain altering exercise to get adjusted to using mirrors so far forward of the cab, but after you get use to them, they are pretty good.
The one pictured above is a slightly different version, but the principle is still the same. They come as a set for both sides of the vehicle.