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C4 door panels are famous for cracking the top edge off and flopping around. If you have ALL the plastic pieces you can learn plastic welding with steel mesh reinforcement, or spend BIG $$$ on new panels, weather stripping, seals and various trim. It ain;t cheap...
Check the catalogs for bare panels and whole or complete panels. FleaBay sells used...maybe n better shape than you have..thats a gamble.
I've got these floppy door panels! Whhat are the parts used to fix them and where can I find them?
Welcome to the forum - floppy door panels are a well known problem.
The stiffening vertical ribs on the backside will fracture and break - causing the upper edge to be unattached.
There are several threads on the subject.
Use the threads on the forum and fix them yourself in one afternoon. It is not that hard and is a lot cheaper than buying new ones. If you feel this is beyond your capabilities then be prepared to spend a lot of money on your Corvette when the mechanics you take the car to only know how to throw parts at it until they get lucky and find the correct one.
There is a lot of help available here. Use it. I did and fixed my door panel.