need help with wilwood brakes!

They are asking if you have 9 or 10 inch drums because with wilwoods they are a bolt on disc brake conversion and fit right your existing spindles. you do not need to
change your upper control arms or any of that. It is a complete kit with proportion valve , braided lines , proper wheel bearings and the rotors are drill for both big or small bolt pattern. So check your drum size and order the ones for your car. These are a good quality easy conversion. Cheers.