If memory serves me right, the coupe vs. vert. are the two that are differnt (seat bottom). The verts seat bottom is narrower but just a bit. I have pics somewhere of each seat with a tape measure laying across them. I don't beleive the standard vs. deluxe int. made a difference. Let me see if I can find the pics, may take me some time as my home PC took a dump, however, the hard drive is still accessable to some degreee...