What is a trailer dome light - sun roof called?

I need a new plastic cover for the dome light or the sun roof on an enclosed trailer.
There is a hand crank that raises it open for some air circulation.
I've looked on Northern Tools and it's not a sunroof cover, nor a dome light cover.

What would the name of the item be?

Mine looks like the exterior was "canvas" but that does not make total sense since it would rot and not be water proof. It was either canvas or the plastic is so thin and fragmented that it looks like non plastic.

Anyone put a name on this needed part?
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nickg5Author Commented:
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