Corbin makes 'em, and they're good too. They're "stiff", so that needs to
be OK with you. Mine made me sit too far back to suit, and Corbin said
they'd adjust it free for me, so their service is good as well. And they
look great:

I've heard so many people say they did this, then they did that, then after
a bunch of iterations they got their OEM seat pan redone by Russell Day
Long... I decided to skip the iterations and:

-Mike