Aluminum back Bulkhead - Left has a 1-piece tweak-free design that is more rigid and robust. Bulkhead feature centering pins at the top surface that align top of the pod dish during assembly and prevent movement between the components during a crash. To help improve the assembly's power and resistance to tweak, the upper pod plate now makes use of 4 mounting screws to secure it on bulkheads. The 1-piece bulkheads use eccentric bushing inserts the back axle height adjustment. CNC-machined from premium extra-hard Swiss 7075 T6 black-coated aluminum for longer life and a stylish appearance.