Very pricey, but it can be done. Ill help you out, but try searching next time
XRS question...
(Via Jeff Lange)
"Here's a list of parts you'll need. I may be forgetting something.
Rear Axle Beam (42101-02200)
Axle Beam Bushings (48725-02250 x 2)
Rear Brake Hoses (90947-A2023 x 2)
Rear Brake Hose Banjo Bolts (90401-10058 x 2)
Rear Brake Hose Banjo Bolt Gaskets (47389-50020 x 2)
Rear Brake Hose Mounting Bolts (90119-A0081 x 2)
Rear Parking Brake Cables (46420-02150, 46430-02150, 47658-12010 x 2)
Rear Parking Brake Cable Mounting Bolts (90119-A0142 x 2)
Rear Brake Backing Plates (47803-02020, 47804-02020)
Rear Brake Calipers (47830-02180, 47850-02180)
Rear Brake Caliper Slider Pins (47835-02160 x 4)
Rear Brake Caliper Slider Pin Mounting Bolts (90016-AA104 x 4)
Rear Brake Caliper Mounts (47821-02160 x 2)
Rear Brake Caliper Mount Mounting Bolts (90105-10510 x 4)
Rear Brake Pads (04466-02210)
Rear Brake Pad Shims (04946-02050)
Rear Brake Pad Hardware Kit (04948-02101)
Rear Brake Caliper Overhaul Kit (04479-02330) -- May not be needed, but it includes slider boots, which may be needed. Not sure if the caliper includes them.
Rear Brake Rotors (42431-02200 x 2)
The rear hubs are the same, the master cylinder shouldn't be any issue, the only difference is with or without VSC, the diameters are the same whether it has rear disc brakes or not (20.64 without VSC, 22.22 with VSC).
I spent quite some time coming up with that list... but it might be missing something, nothing major though."