Supreme Front Heavy Duty Improved Design Steering Idler Arm (MK6512T) by Mevotech®. Quantity: 1 per Pack. Idler arms are used on vehicles with steering box style systems. Idler arms are normally attached directly to the center link, and they support the front steering components because they attach to the body of the vehicle. On some light-duty trucks, two idler arms are used. If you need to restore your vehicle to its original steering efficiency, go with Mevotech steering parts to keep on the safe side. Mevotech steering components are right what the doctor ordered for a stable, comfortable ride.