Polaris RZR XP 900 Models Rear Sway Bar Kit by Shock TherapyXP 900 Rear Sway Bar If youre looking for the ultimate control in body roll for your XP 900 look no further than the Shock Therapy newly designed rear adjustable sway bar and link kit! The XP 900 came factory with a thin wall hollow bar that never allowed the correct over extend or twist and commonly led to breaking the sway bar near the bends or even at the bushing block. In the off road environment, the only sway bars that last are solid ones. They