I've looked into this in the past but haven't replaced mine yet. There is a guy named
Stephen Worsfold in Wisconsin who can craft a frameless less that uses the existing hinges. According to the J34c website, Steve's number is
(218) 349-6020. The product looks like this:
http://www.jcruiser.org/uploads/3/4/3/3/34331946/bomar-ports.jpg. I don't know much about it, but I am intrigued by it.
Another option would be to get Bomar replacement parts from Pompanette. I think the model numbers are as follows:
Bomar port lights 3000 series extruded aluminum
Cabin - 4 total
Portlight = Bomar N3519
Screen = Bomar P3000-04
V-Berth - 2 total
Portlight = Bomar N3414
Screen = Bomar P3000-01
I hope that helps. Please keep us posted.
Jeff