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Heres some pics of the replacement dome light and the hole in the new replacement abs headliner.
The dome light location would be the same in the factory headliner.
Note the 2 small screwholes in the roof structure in the cut out in the headliner.
(You can only see one in the pic.)
Thats where the dome light mounts.
You can get the dome light cheap on line used or at any parts yard from any 80s-90s GM car.
MY factory dome light was toast so I got this one with the spotlights out of a Buick for $5 bucks.