The biggest difference I have found between original air cleaner decals and reproduction ones is that the original ones had the foil finish applied over a thin manila colored layer of cardboard, like the photo Z28-RS posted of his original one. A few years ago now I stupidly replaced my original one because it was peeling away on the edges with an all foil one. I'm waiting for someone to reproduce one with the correct thin piece of cardboard under the foil top.