These direct replacements for the factory part improve the stability of the rear of the car, provide for better tire wear, better tire contact surface, and better range of suspension setting- which all leads to a better handling car and thus faster lap times. We use aerospace quality rod ends and components to provide for the most durable, accurate part available. With left and right hand threads, our Control Arm Links allow for precise infinite adjustability, and ease of setting. Also included are seals to protect the monoballs in the harsh exposed environment. Sold individually. Available for the 996 and 997.