Posted for Rick titsworth <rtitsworth@mindspring.com>:

 Bill etal,
 I had the opportunity to see one of the prototype seats while @ builders
assist in Oct (along with Mike Easely).  Certainly impressive/clean looking.
 The (non-technical) reason that mounting/adjuster rails are a different
spacing that the std/old seats is that they are "outboard" of the seat frame
to minimize the height (maximize the energy foam thickness).  The std/old
seats have the adjusters "under" the frame.
 Rick