Been there, done that, didn't like the results
I bought my boat (1983 H30) in May of '03, and one of the first things I did was replace all of the portlights. I got "Original Equipment" replacements lenses from Pompanette, and the quality was awful. The cut-offs for the springs around the hinges on the larger ports looked like they were done by hand and each portlight was a little different from the rest. By Spring of this year the two largest portlights had already developed cracks and two of the dogging lugs had broken off completely. (And no, it wasn't from over-torqueing the dogs - I took proper care of them.)I replaced the four largest ports with bronze ports from New Found Metals. It was expensive, but compared to the cost of the shoddy replacements I got last year it was a bargain. It was a lot of work and a nasty job, but they look great and work better. I plan to replace the smaller ones with bronze ports as well eventually. Plus the folks at New Found Metals were great to work with.Email me if you want more information.Steve Young