TeraFlex JL: Alpine IR Long Control Arms and Alpine Long Arm Brackets (NOT INCLUDED) provide complete alignment adjustability and dependability for maximum performance on JL Wrangler/Unlimited models with 3�6in lifts. 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. Must be used with Alpine Long Arm Bracket Kit (JL 2-Door: 1958002 or JL 4-Door: # 1958000) � NOT INCLUDED.