I am in the process of replacing the door draught materials on my BJ8 Healey I received from Austin Healey Spares. Trying to figure out whether when doing so I need to use those little metal clips to hold it in place. Seeing mixed info on it, but looking at the clips it seems like they should be used as they fit nicely under the metal part of the cloth strip. If so, does anyone know how many should be used?