chiming,
heres a pic of my set-ups, but they are strictly for pre 02 stuff, but the bracket would work to mount the master, locating it, aligning it to the pedal would be on you, and i'm not so sure the way my master bracket mounts, that you'd be able to slide it down/forward far enuf to match up with that short ass pedal extension on the 03 peg/pedal combo ????
as for masters go, i have used every conceivable style and make of master cylinder with the gsxr calipers, they all work, my first set, now on my sons with my old frame has a banshee master (made for small single piston caliper)
and it works like a champ, as it has for 3 years now, easily pushing all the fluid the gsxr dual piston can handle
last year i bought a box full of masters, about 6 different brands and makes, they all worked flawlessly except the few that need rebuilt
my suggestion would be to keep your pre 03 peg, and i can extend that pedal for you, and supply a master bracket,
or just a bracket and your on your own with the 03 pedal ????
unless you wanna ship the master and 03 peg/pedal to me and see what i can do with it ???
pm me if you decide i can help you
or use this pic to fab one yourself,
i use 3/16ths 6061 aluminum, it's strong and hard, and cuts nicely,
softer, thicker aluminum is hard to cut and bend