Are the GSX twin piston calipers a direct swap on a GS? I've heard that they are but the rotors are a little bigger. Is this correct? If the rotors are bigger, wouldn't the calipers need to be positioned further away from the hub? I've found some calipers for $20 a piece that only need to be rebuilt and I'm considering getting them and rebuilding in my spare time, then swapping. Any ideas?