Piaggio's parts are rare to find.
i tried hard to find them but all in vain...
i might go ahead with Deluxe setup now...
The only thing bugging me is that i'll have to change front fender too with Deluxe setup.
It's gonna be expensive but totally required on heavy bull like GS.
Can't ride on 60Km/h always just because it has crappy brakes.
And yeah rim will be changed for disk brake setup, you can see why....