Have suggested this to several people. From experience get in touch with Robert Doerr.
This guy does brilliant work and for much less than the Mustang, Ultimate, DayTripper or other Aftermarket seats.
Have an Ultimate on my VTX - love it - wouldn't trade it. Just after I bought it I came across Robert's work. Got him to rework seat for the wife. As good or better ride than my Ultimate and for less than half the bucks....