Genuine OEM Audi Upper Control Arm, part number 420505323D. This critical suspension component connects the wheel hub to the vehicle's chassis, allowing controlled vertical wheel movement while maintaining proper alignment. It is specifically designed for the rear left side of the vehicle's suspension system. Constructed from durable aluminum, this control arm weighs approximately 1.86 kg. Opting for a genuine OEM control arm ensures the correct geometry, material strength, and bushing quality, which are vital for maintaining precise steering, stable handling, and a comfortable ride.