I have a Corbin on my Tbird. I'll post a pic. For me the seat is much more comfortable! I hated the stock seat because it so flat, almost like a cafe seat.
Now I warn you... take the time to call Corbin and discuss the option, because they are endless.
I wanted one that was brown leather with a smooth seat, (no seams). The seats are very firm but they recommend several hours in the saddle to allow breakin.
not the greatest picture, but you can see that it is a deep seat. The tank is off because I'm in process of painting my Tbird.