The first 250-or-so Panteras were built with aluminum tanks. Of course, the U.S.DOT made aluminum gas tanks illegal in '71 ('safety' issues), so as a stop-gap for cars already imported, Ford had an outside contractor cover those beautifully welded tanks in a couple of layers of fiberglas, then began replacing them with a steel version free of charge. So yes, threy're pretty rare in the US. And no, they're not dangerous- quite a few are still being used- hard- by European Pantera owners..