Aluminum back Bulkhead - kept has a 1-piece tweak-free design that's more rigid and robust. Bulkhead function centering pins at the top area that align the top of pod plate during set up and stop movement between the elements during a collision. To further enhance the set up's strength and opposition to tweak, top of the pod dish now uses 4 mounting screws to secure it to the bulkheads. The 1-piece bulkheads use eccentric bushing inserts for the back axle height modification. CNC-machined from premium extra-hard Swiss 7075 T6 black-coated aluminum for longer life and an elegant appearance.