Pardon my ignorance, but what happened to your Bomar hatches that would require their replacement? My new-to-me PSC 31 only has one, and it was not in great shape. But it was relatively easy to take the frame down to bare aluminum and repaint, then install a new acrylic lens and gasket. I'm sure I didn't spend much more than $75. There's also a company that will do all of this for you for about half the cost of a new hatch.
PSC 31 No. 55, s/v Ann West