These are similar to the above mentioned McKesh mirrors, I just didn't mount them in the window. I bought them at Camping World, I think the brand name was Eagle.
The upper hook slides into the front body panel near the hood hinge and the bottom strap grabs on to the lower pinch weld.
They have left some scratches in the paint (I don't care) and they are not as stable at the stock mirrors, but still usable at 65 mph.
The big bonus over the Cipa mirrors is I can pop 'em off and on and they don't require readjustment every time. I had a pair of the Cipa's and it's always a two person job to get them 'just right', then the rubber feet slip two days later and you have to repeat.
edit - this picture was taken before the AirLifts were installed...