Just make new ones
I replaced mine this year with cut plexiglass. I took the old window frames out and brought them to a plastics supplier. I had them cut the plexi to the same shape but 1" larger all the way around. I drilled holes about every 6" around the perimeter of the pieces, 1/2" in from the edge, and screwed them to the outside of the cabin. I sealed with 'Dow Corning 795' on the advice of a local boatbuilder. This way I retained the distinctive window shape, removed a source of leaks (the old windows leaked between the frame and the lens), and updated the look of the boat significantly. I don't have a picture but this was a simple job and two of us got all six windows installed in a long afternoon, about 4 hours and we could probably do the next six in half the time.