I have a perfect late model C10 seat that I pulled the cover off and carved back the step about 4 inches so it is still thick and cushy (the good part of the seat) but doesn't shove you into the tank and lets you sit a little further back. The cover looks great other than the slight loose part on each side where the foam was removed. Don't misunderstand, it looks great but if you know what your looking at you can tell.
I used this as I was having my Corbin recovered and now that you are not shoved forward I love the seat but being verticaly challenged I need the deep cut of the corbin for stability at a stop.

$120 shipped, nolatching hardware so you will have to use yours.