The Rare Parts # 21037 Extreme Duty Idler Arm Bracket is designed to replace the factory version on select Chevrolet and GMC vehicles. If you own a lifted GM fullsize truck or SUV and you are tired of replacing prematurely worn out factory steering components the Extreme Duty line by Rare Parts is for you! The factory steering components are suitable for stock vehicles but can quickly wear out after larger tires and wheels are installed. If you want to increase the reliability of your vehicle upgrading the steering components is one of the best places to start! Keep reading below for important product fitment information.