Fitment: (2012-2014) Polaris RZR XP 4 900. Our RockSolid BackBones tie the rear of your cage to the RockSolid rear bumper. With features like the 6 bolt cage clamps and a specifically designed shape to retain the use of your Polaris Lock N Ride box in the rear of the UTV, these BackBone support bars give you the best of both worlds. Features: 6 Bolt cage clamp mounting system, Made in the USA, Special shape works with Lock n Ride box, Ties rear of cage and RockSolid bumper together, Added support, strength and style to OEM cage, Allows for addition of spare tire carrier, NOTE: This product will NOT work without our RockSolid Rear Bumper. Fitment: (11-14) RZR XP 900.