My '69 vert originally came with the d/s remote, but that was long gone before I got the car. I had a hard time finding it without paying a fortune and finally gave up. I mounted some 70's bullets, but I dont like the way they sit. I finally bought a matching pair of simple, chrome mirrors that will go on once all the body work is done. I agree its about symmetry and I think it looks best with matching sides.
But its your car, so do what you want with it. Once the tops down, I agree, the mirror will provide only a little more to see compared to the big open sky and "no blind side" driving..