SuperPro ALOY0020K SuperPro Alloy Front Lower Control Arm Set - GC & GD Impreza, WRX, & STISuperPro ALOY0020K SuperPro Alloy Front Lower Control Arm Set GC & GD Impreza, WRX, & STI SuperPro's ALOY0020K control arm set replaces both the ALOY0004K and ALOY0008K control arm kits. Fitting a wide range of GC and GD platform Impreza models and a range of other swapped and upgraded Subarus this kit combines and STI style alloy lower control arm with a geometry optimized rear mount and bushing assembly, a new ball joint bosses, upgraded forward