I just bought a 4”inch replacement filter for my tent and it claims in the pic that you can swap the flanges or caps around to double the life of the filter. I dunno if they sent me an old one or whats going on. The caps are black but look to have the same rivets as the old one. I wouldn’t think they expect you to cut the rivets to swap them and then re-rivet it. Any help would be greatly appreciated??