As an old fart there is no way that I can drive with one of those thin, un adjustable seats. My plan is to attempt the build with the stock seats and see how it works. I think that FFR's new direction of a specific 818 tank that allows the driver's seat to go back further combined with sliders is the best bet, long term. Perhaps I'll make up my own or Boyds will do one up. The current tank's design with the stepped level, sender lower than the pump fitting area makes no sense. Since the seat ends up at an angle it can be thin and tall behind the driver and fat and tall behind the passenger with the passenger seat being fixed.

IMO the some of the $300 or so seats don't look well stitched, the upholstery puckers etc...