Where to find 1st gen camaro audio equipment?

[birdman3r]

I couldn't seem to find anything on this with the search function, but I am new here, so don't hate me if this is a dead horse.
I am looking for some products to install a new stereo and speakers without modifiying any original pieces. Swapping them out would be fine, so long as I can get the car back to original when I sell it. I know about custom autosound and secret audio for the stock or hidden head unit, but it doesn't really seem to be up to the standards of audio quality I like to have. Has anyone found any good kickpanels, adapters, sub boxes or the like made specifically for the first generation Camaro?