replaced mine in a '90 H-27
I just replaced all the portlight windows in my 1990 H-27 (a total of five including one for the rear berth). It was much easier than I expected and each appears to seal well -- so far no leaks. Mine are Beckson brand and in addition to the clear plastic windows, I also ordred new screens from Sailnet. None of it was all that expensive and at the time Sailnet was having a sale. I did not get replacement rubber seals as the ones I had seemed to be fine. As it turned out they leaked slightly before, but since I cleaned the rubber real well and applied a generous coat of 303 to protect agsinst UV rays and soften the rubber, they are doing great. Finally, rather than getting the smoked color as before I got clear plastic and it allow smore brightness into the cabin.