Does anyone know if the 'new' door pockets for the 69-73 cars being offered by Porsche Classic are made with an improved construction material other than the original material (almost cardboard-like)? There seems to be two offerings for replacements - the ones from Porsche and an after-market set (at about $1800) vice about $2800 from Porsche. I see that the after-market set's construction is fiberglass, but my Porsche dealer is unsure of the construction of their offering. Can anyone help please?