C and A will not work with your seats (the evo 2 that is) you will need the "b" to make the setup as narrow as possible.
do you have a sunroof? when I installed my evo 2 seats I could not get them to sit low enough on my car to fit a helmet and still have head clearance. the issue is the seat is wider than your stock mounts so the seat can not sit low enough- I had to do a good amount of work to my car to make them fit- if you would like to talk over the phone shoot me a pm and we will connect
here is what I had to do
