I recently purchased a 70 SS. One of the items that I am trying to find is a manual outside rectangular mirror. All the mirrors that I find in all the catalogs and parts places are listed as the same one for the Chevelle. They have the two screw base plate and have one screw holding the mirror to the base plate. The mirror on my car has three screws in the base plate and two screws holding the mirror to the base plate. According to the GM assembly manual the Chevelle mirror is different than the Camino and the Wagon. What's your experience?