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Have you checked out ACCs cutpile floor mat sets for our cars? They are near exact to ours minus the GM rubber emblem which can be sourced from a junkyard or eBay and they have rubber bumps on the backs for better grip. A member here actually worked with ACC to get the measurements for our cars and it shows.
Rockauto has them for $100 a set shipped. I recently ordered a set and they look pretty good.
The shape is near exact to the factory originals which I still have.
You'll probably want to narrow your search to late 91-92 mats. That's when GM started the switch to the rubber stud backing instead of that tar like earlier backing that's prone to staining the carpet.
I have been lucky and just pulled them from the older mats. I've also seen them on new generic gm delco replacement mats. Which is what I have done for 1 set of mats. 2 new sets to make 1 set but then you have a generic set to put down instead of trashing the good set.