Chewy,
Check with Year One or look thru the mags for Camaro restoration places, or do a search on the net. Try this search engine <a href="http://www.ixquick.com" target="_blank">www.ixquick.com</a> I've seen the rear fold downs in the Camaro but you don't see then too often. One of these places should carry the hinges you need. If you cannot find them look in the yellow pages for a metal fabricator and someone that knows how to run a mill and lathe should be able to fix you up fairly reasonable. Don't doubt yourself. They did make the folding seat. If I remember correctly I think at one time the advertisements showed the seat with someone putting skis in there.
Kevin