[LMH]

Brake components need to be able to work together as an assembly. Best advice I can give is to call a company like Wilwood and talk them about options. You should do the front and rear at the same time using matched components. They can most likely steer you right. You will probably need to know what master cylinder you have and the size of you intend to reuse it.
BTW, I have 12.19" rotors on my Hurricane with 15" wheels. That's about the biggest you can get under the wheel.
Larry