Can the seat push buttons be replaced?

Yes, the knobs can be replaced. There should be a small allen set screw on the bottom or back side. I cannot imagine the knob itself is bent, maybe the metal piece that it screws to. As to availability, don't know. I might have a set - I can check for you tomorrow. Can you post up a pic of your seat and set up so that we can verify they style that you have?
C