Thats it. Couldn't remember exactly how it was as I've never ordered one. You give them your height and inseam. I sat on a Busa with a Corbin. It was the worst seat I've ever been on but it was made for a guy over 6 ft tall
I wouldn't pay $2 for a Corbin seat but that's just me. Aren't Corbins made for your height and weight? (Pretty sure they are for the Busa) If so, you'd be buying one made for someone else's ergos