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Frames for cabin dead lights, as used on Elco 77 foot PT boats. No glazing included; set these into cutouts in the cabin roof per your drawings, and glaze after painting with a product such as "canopy cement". Using a toothpick, drag a drop of this thick liquid around the opening; with practice, you can pull a film over the entire opening, which will dry to a clear glossy glaze.
These were also usually "blacked out" in theater. In that case, simply spray over any filler material you like.