I am having Jim Cowles modify a 67 Mustang valance to match an early 67 Shelby. He has looked at a few early cars and has noticed a screw at the top of each bezel. He is not entirely sure how early this appears and when it ends. My #89 car will be fitted. Any thoughts on whether this screw is correct or not for mine? He will be sending me a picture of an early car's valance and bezel.