Fortunately I was able to acquire an original SS air cleaner recently from Jared (thanks!) and in the process of restoring it I was able to remove the original 'CN' decal off of it fairly easy. After some research I was not able to locate this decal anywhere so I decided to try and duplicate it. I scanned the image into the computer and, pixel by pixel, cleaned up the image to my satisfaction I then acquired some waterproof labels and printed them out via a laser color printer. From here using a straight edge and a razor blade I cut them out and they are shown below. As you can see there are some light spots due to the laser printer but oh well. I also included a shot of the build sheet showing the 'CN' in the Air Cleaner box which I believe is specific to the LS5 in the 70 SS Monte Carlos. I am not sure about the 71 SS or 72 Montes. Hopefully this helps some understand what those two characters mean when looking at those decals as I had to dig around to figure that out myself.