Hello, I have a few questions to ask of this forum.

1) I'm looking for a rear seat frame. Is the frame model specific or will other model frames work?
2) Obviously the driver's seat isn't adjustable. But I'm a little taller than what the fixed seat allows. Does anyone know of an adjustable kit or has anyone improvised this problem themselves due to the placement of the fuel tank?
3) Has anyone ever changed the rear differential gear ratio that would allow some highway driving? If so, what gear ratio did you use? I'm more interested in keeping up with the traffic flow and not be run over!

Thank you!