what is the best way to install outside rear view mirrors. My 69 only has the inside mirror. I would like to put on bothe the drivers and passengers sides. i have seen them mounted on the doors and on the door hinges, tell me what you think ( or know ). Thanks for any help and if you know where i can get a cheap set that would be great also. Do not need show quality, just where they will stay on the car and the glass is intacted....Robert