my first car was a 1992 z28 with G92 and a 350 tpi. Still have it too.

 

1990-1992 third gens had door mounted cupholders as an option. *Should* be able to be mounted to your door panels if you don't have an issue putting a few holes in those door panels. The screws that mount them thread into the inner part of the door, so you would have to figure out how to make that work. If you want to do that, contact me, I can get some pics of how they are set up. I have two parts cars with them currently.