maytag wrote: they have a LOT of lateral support. the seat sorta hugs you.
of course, that can be painful, when your butt's as big as mine....
I got the seats from a feller in the UK who was having them made for MG's & Triumphs.
I tried to sell them on this forum this spring, with no takers at $400/pr OBO. (included slider hardware)
I've got a skinny butt, those look comfy.