The SuperPro Front Arms are a standard replacement with Bushings and Ball Joint. Front Caster/Radius Arms utilize a SuperPro Bushing with a heavy duty Ball Joint. The Bushings allow full articulation and movement without binding and with no increase in noise, vibration or harshness. Key Features: OEM Quality Alloy Lower Control Arms Pre-Installed SuperPro lifetime performance bushings New OEM Quality Ball Joints Direct Fit Installation Complete Control Arm Refresh with SuperPro Lifetime Performance bushings SuperPro Tip Designed and packaged to be replaced as a pair. SuperPro maintains it is critical for a pair to installed to any application at the same time to avoid any detrimental handling and braking characteristics from a mismatch of bushing material.