Under dash air box colors?

[kna4977]

What color were the originals on a factory a/c setup? I’m in the process of cleaning up and restoring and replacing what I can but each piece seems to be a different color. The heat/defrost metal box looks to be some type of dark fine metallic gray. The vent at the bottom of that piece is a lighter gray. The S duct is also a fine metallic gray but is more flat in sheen and it’s plastic. The diffuser is some type of brown and the final piece that goes to the firewall is a brownish gray. Were there really this many different colors going on originally or what is it supposed to be in color?