High Lifter Frame Stiffener Sub-Frame Gusset Kit Polaris RZR XP 1000 / XP 4 1000 This framework fortifies the a-arm mounting positions, restraining the tabs from stretching, which enables extra products and weight to be added without compromising the structure's stability. This design offers a solid base to ensure the longevity of your unit. For a significant enhancement in the rigidity and durability of your unit, consider incorporating a 3D notch-and-tab design. Features: Provides extra strength at the weak points on the frame 3D notch-and-tab design greatly improves frame stiffness and strength Designed to reinforce the a-arm mounting positions and prevents tabs from stretching Gives strength when adding portals, big lifts, and bigger tires Made with 3/16 or 4.5mm thick heavy-duty steel plate Complete bolt on kit that includes 10.9 grade hardware Helps to prevent frame flex at key mounting points Powder coated for a durable, clean finish Note: These kits may not work with aftermarket skid plates. Check with skid plate manufacturer to confirm if this kit is compatible with skid plate package.