The K0 seat has a distinct block pattern stamped into the vinyl cover, slightly less padding from the somewhat loose-fitting strap forward, and has the 'duck-tail' at the rear. The K1 seat is known as a flat seat but continued the 3-part trim strip as the K0. It has an elongated pattern and has no duck-tail.
The K2 - K6 seats are all the flat type and have various but somewhat similar stamped patterns. The latch and hinges were changed from the originals, and the owner's manual pocket was added. The trim strip is a single part.
The original K0 seats have a pinkish-red foam pad. All other seats have yellow/white closed-cell foam pads. Other differences can be noted between the models for how the covers were fastened to the pans.
