Some states require outside rear view mirrors. Driving a Darrin with the top up and no outside mirrors can be dangerous. I have added a pair of windwing mirrors to my Darrin. I did not want to put mirrors on the fenders that are more than a foot away because I can see in them and I did not want to put holes in the body work that I spent so much time on. The mirrors are mounted high on the windwing windows. Made of stainless steel and adjustable, they clamp onto the plexiglass. The mirrors are inexpensive and readily available.