Detroit Axle complete control arm assembly are pre-assembled with bushings mounts & ball joints (when applicable) - no additional parts or tools required for installation. Each Detroit Axle suspension control arm is designed to be a direct-fit replacement for easy installation better ride and serviceability. The core of a vehicle’s front suspension system control arms or a-arms connect the front wheels to the car. Designed to allow the vehicle to turn and pivot one end connects to the wheel assembly and the other connects to the framework of your car. Detroit Axle control arm with ball joint assemblies for foreign and domestic nameplates are engineered for structural strength and corrosion protection. We have a professional evaluation process to ensure smooth driving stable direction and convenient handling.