I hear you. Those metal ones you found, those were not original in the Camaros were they? Were they home made ones. I know a guy the has a computer ran plasma cutter. He could make a boxes easy I think. I'll email him with a pic and see.

So the first two photos of the cardboard ones. It looks like the bottom is turned out. I take those were repro ones?

Studying this picture it appears it is turned under doesn't? I should be getting the speaker any time now and maybe I'll be able to tell when I have a speaker to work with. It may be to awkward to install with the lip turned back under it.