The twin post mirrors do go on the doors. Only the side by side 2 post mirrors pictured on the blue C body can go on the fender. I see lots of C body cars with fender mounted mirrors. Not so with A bodies. They are always factory mounted on the door. Do you have a build sheet for your car? It might tell which mirror it left the factory with. If it was dealer installed you may never know for sure if it was not remote control.
