Parts & Accessories Spare parts To the JK owners.. If you want your car to be "straight" on the highway and powerful in the desert, and you want to forget about alignment issues after lifting, these (Alpine IR) arms from TeraFlex are the ultimate solution. What distinguishes the IR series? This series features (Independent Rotation) technology, meaning the bushings (rubbers) rotate freely 360 degrees. This gives you incredible flexibility in sand dunes and "crawling" without the rubbers tearing or stiffening, and most importantly, it excellently isolates road vibrations and harshness (NVH). Features and Benefits: Precise Alignment: The arms are (Adjustable), meaning you can precisely adjust the caster and differential angles, and restore the suspension geometry to its correct position after lifting (from 2 to 4 inches). Maintenance-Free: The bushings and joints are "Maintenance-free". Install them and forget about greasing or lubrication. They are very quiet and do not make noise. Immense Strength: Made from durable 42mm diameter DOM tubing, they can withstand the toughest impacts on rocks. Complete Flexibility: They provide very high (Flex) range in rough terrain without restricting the car. Easy Installation: "Bolt-on", install directly onto the factory mounts, no cutting or welding required. Coating Quality: Coated with a black heat-resistant (E-dipped) coating that resists rust and corrosion in the harshest conditions. Aluminum Lock: Comes with a strong (6061-T6) aluminum collar to secure the alignment after adjustment. Compatibility: Jeep Wrangler JK: 2-door and Unlimited (4-door) models from 2007 to 2018. Lift Height: Suitable for cars lifted from 2 to 4 inches. Technical Specifications: Much stronger than factory arms. You can extend or shorten them as needed to adjust the wheelbase. All parts are brand new.