The inner dimensions of the forward hatch (& also the headliner opening) on my 1983 are 19.5" x 19.5". It is a black Bomar hatch, the original I believe.
I have a Bomar hatch and the hole is 19 5/8 beam to beam direction and 19 1/2 fore and aft. The hatch is mostly about 1/8 smaller than the "hole" in the liner.
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