I have a set of rear seat side filler panels, that I thought were an extra set for my 70 SS chevelle, my ss has plastic side panels and the extra set I have are metal, covered with black leather or vinal.They appear to be the same except on the bottom where the panels have a notch in them they are a little different, anyone know what these are out of?I believe I took them out of a wrecked 70 ss,but that was 25 years ago.