Upgrade your rear suspension for added toe adjustment and reduced weight vs the OE link with this adjustable aluminum control arm from SPC. This lower arm features a xAxis sealed flex joint that performs like a monoball, but is greased and booted, providing maintenance free unsprung travel. Fully forged with T6 aluminum, SPC's high strength arm will inspire confidence on the track while withstanding the rigors of street driving. The included lockout plate replaces the factory toe cam to make sure your toe settings can't slip, even under the most extreme loads. (Arm is sold individually (ea.), consider 5 arm set 72360 to upgrade camber and toe links on both sides of your s550) California Residents WARNING Product appearance and features may vary in the market as design changes, improvements and modifications are implemented.