SPL Parts 2009+ Nissan 370Z Front Upper Camber/Caster ArmsSPL 370Z Front Upper Control Arms (FUA) for the Nissan 370Z and Infiniti G37 are designed with dual chassis mount adjusters, providing camber and caster adjustment while remaining fully attached to the car. The revolutionary slotted arm design does away with the need for bulky, hard to reach jam nuts. Simply turn the hex cap Double Adjusters to set the arms to their desired length, and then lock your alignment settings in place with an allen wrench.