Joseph asked: OK. I cannot get this straight in my head (and my father-in-law who was in the body shop business tried to explain this to me several times), how can one tell the difference between a hardtop and a sedan? My reply: Well, lets start with what we know a sedan is. It has four doors. It has three pillars holding up the roof on each side. One at the windshield, one at the rear window, and one in the middle, between the doors. The doors are fully framed, which is to say the glass moves within the frame and their is a seal all around it when the window is closed. A four door hardtop does not have the middle pillar. With the windows open there is no obstruction between the windshield and rear window. The doors are not fully framed. When closed the windows seal against the roof of the car, the front and rear pillars and with each other in the middle. The name hardtop is confusing. It is an abbreviation of the phrase 'hardtop convertible, which is almost an oxymoron, or 'fixed hardtop convertible,' which definitely is. The idea is to give the impression that the car is a convertible without actually having a roof that opens and closes. In some sports cars, they do indeed have a canvas roof for the summer and a hardtop roof for the winter. The hardtop obviously cannot be folded away but can be removed. No Imperial had a removable hardtop. Also, many Imperial coupes are really two door hardtops and not coupes at all. Hope this helps. Hugh 58 4 door hardtop.