As a long shot if Queenship Yachts is still around someone there might remember from the Cooper days who their supplier was. Another source might be RV/Trailer manufacturers for the gasketing if your frames are OK.
I know a friend who had a Cal 35 with similar windows replaced them altogether but can't remember the source, nowadays stuff gets shipped from almost anywhere.
While those are big windows, with similar style but smaller I've seen the gaskets replaced with a sealant like DC 795.. keep a few short pieces of the gasket to center/locate the glass and after masking things off fill the surrounding gap with the sealant.
I think you may need to get creative and look for other sources for the gasketing, pretty well any glass shop should be able to source the actual panes to your specs and measurements.
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