My boat is a 1981 H-30 and the sun has taken it's toll on several of my portlights. The frames are fine, it is the lens hinges that have become brittle and cracked/broken. I have found numerous sites that carry Grey series portlights as well as Beckson and other brands. However, I can't find the larger of the three sizes which the lens measures 8 5/8" X 18 ½". My question is three fold: 1. Where can I find this particular size? 2. Since the frames are fine, is it possible to just change out the lens? 3. If I can't find this size and don't care if these ports open, has anyone replaced a port with a non-opening port/frame and how did it come out?