a bit late jumping in to this but hey, just came back form holidays!
as many racers here, got tired too from my stock twin disc set up, going for brembo's for next season.
with it being a 500, the brembo's F05 looked good enough, many racers here are using them, and their pretty cheap too.
+ a 3 lbs /1.5 kg less un-sprung weight is not bad either.
I also tried to see if the bigger, F08 brembo's would fit but if you are using a twin disc like me, there's no clearance to the spokes unless you go for triple clamps with bigger distance between the tubes or totally different hub. dont have time/money for either
The idea is basically the same as in the "hales honda" but with my setup i didnt have to machine the slider as they did. the deep milling in the bottom bolt (fender stay bolt) is quite a critical as it really weakens the area where one of the spindle studs attach. also the shaving of the fork doesnt look so safe to me but maybe on a 350 it's acceptable.
hadnt run it yet, will tell you how it works after my first 2009 race in about three months....
Cheers
Tg