Here are pictures of the plastic strips and where they go, relative to the sail panel. They are probably cut from standard profile 1987 stock, rather than extruded for this purpose.
They were glued to the car, somehow, and the beaded edge was hidden by the sail panel, as in the second picture. There doesn't seem to be any place to glue them to except the pinch weld, which isn't much surface area.
They were badly warped and curved from sun and time, as well as likely shrunken shorter than original. I used a heat gun to straighten and lengthen them and they are much better, but still a little crooked and warped.
The pictures are rotated from how they are saved.