When I started my tear down 10 years ago I needed new sail panels as the ones in my 68 Polara were very brittle. After a few years of searching on eBay I found some. When I received them. They were more of a fiberglass vs brittle plastic which was a plus. However I noticed the new ones (black in the pic) had three screw holes for retention vs mine (red ones) only had 1 screw hole. What gives? Is the 3 hole a late year switch? Or did the Plymouths and or Chryslers use 3 holes vs one? Any ideas? Ultimately I would like to find some with just one screw hole, but may have to live with the 3 hole.