The drip rail is actually composed of 2 or 3 different pieces of sheet metal that are part of a larger part of the car, such as the roof skin, so it is kind of tricky to just replace it because the welds get tricky and messy since access isn't great. You'll have to shave it off as close to the body as you can and then butt weld a new one to it. The problem with this is you'll need a continuous weld (aka numerous tack welds joined together). Seal it up with seam sealer and not fiberglass.
Drip rail on 1967 coupe is actually one piece with a flange that is welded to roof frame up and under roof skin, UP TO around where the top of door vent window meets drip rail. From this point towards front of car, drip rail flange is spot welded underneath weather seal and down front pillar. This area can be removed and replaced with donor piece.
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