Hmmm, good question. I'll have to check. I know the '73 has lines stitched across the full width of the rear seat, spaced about 1-1/2" apart. The new '74 covers have smooth panels with no stitching where the center passenger would sit. If I'm not mistaken, the old '74 rear seat is fully stitched like the '73. I think I still have all the covers, I'll compare and let you know.