Drip rail 1973 Mustang Mach 1

If you are speaking of the rail itself and not the chrome molding, you are out of luck. The drip rails are not being made in repro form. You will have to remove them from another car or fabricate them. I've seen some cars that have them removed for a cleaner look, but as you probably know, any water on the roof is going to enter an open window.