My wifes '71 RR has devoloped the cracks in the doors that are somewhat common. These cracks begin at the top of the door, in front of the side view mirror, and run vertically for usually under an inch. After making the repair to the metal, how is this condition best prevented? Should I replace the door hinges, and if so, who has them? I would like to patronize someone that supports this forum, but I need them ASAP. Thanks.