Last night we found the build sheet beneath the springs on my back seat. Very fragile and brittle as I expected. Does anyone know what these numbers mean? For example "road wheels" has a number 84 typed beneath it. It has to mean something. Also tied to the springs were these two tags with the exact same number stamped on each of them. But I have no clue what they mean or what they were for. It's a 1974 plymouth duster with its original 318 and trans. Im sure someone here has some answers as to decoding a build sheet. Any info is appreciated, thanks.