I have long wondered why Oldsmobile put the seam for the front inlet on the top side of the air cleaner. Well, I just found one that was flipped. After noticing this one was flipped I looked through pictures of others I have had and the one on the 63 barn car I had was on the bottom. Now I need to decide what one I want to use on my car. I am thinking about using the one with the seam on the bottom.