TeraFlex JK: Alpine IR Short Control Arms provide complete alignment adjustability and dependability for maximum performance on JK Wrangler/Unlimited models with 2-4in lifts. Bolts to the factory control arm mounting brackets. Can be added to any existing suspension lift. Our innovative IR Bushings provide unrestricted rotation and flex as well as excellent NVH damping. These maintenance-free bushings improve on- and off-road ride quality and performance.