I put in aftermarket seats, Procar Ralleys- they are great.
How big are you (height, weight, waist size)?
I'm a big guy and Procars are too little for me (6'4", 275, 40") in the area of the kidneys. What I mean is I can't feel my ancles after ten minutes of them.
I cut out the risers but made my seat brackets to where they bolt up to the sub frame connectors.