Great find! It's great to see all the original interior. I've got a '72 blue on blue Blazer too and I always wondered if the entire interior was really all blue (carpet and all). I guess you answered my question! Take good care of those interior rear side panels. Take them out now and store them away until you've got it finished. They're worth a fortune! I forsee much welding in your future. Good luck with it. Keep us up to date on the progress.
Mike
http://photobucket.com/albums/v666/mfs3k/