I did that on my Driver's side after much time trying to figure that out. I removed the cover piece for the seam just above the front of the driver's side window, then squirted some lexel into the obvious hole in the seam that I found, then covered that with adhesive and a rubber strip the whole way down. Finally I screwed the metal cover strip back over it with a little lexel in each screw hole, then lexeled the strip on each side.
Been working very well!
Mike