65 Barracuda- Rear trunk wall

Hey fellow A Body fans, I just brought home my second 1965 Barracuda, the first one was my college car 30+ years ago. The previous owner butchered the rear trunk wall (that folds down) with a hideous arrangement of speakers and woofers. I have been digging around but cannot find out what the original material for that trunk wall. Was it wood, composite board, or some other materials? Any insights here would be greatly appreciated. Also, special shout out to any fellow Canadians, I am in BC on the south coast and looking for parts! Thanks everyone.