CNC-machined LEFT back bulkhead produced from premium extra-strong Swiss 7075 T6 aluminum, black colored coated for long life and trendy appearance. Strategically machined for paid down fat while retaining strength. The small back bulkheads including the top bulkhead clamps are dramatically reduced and lighter, providing ultra-low CG for the back suspension. Created for very swift & easy ride height adjustment. No more hassle to dismount the automobile to alter a corner ride height! The included ride height shims are inserted between the bulkhead and upper bulkhead clamp to change ride height: smart & effortless. The new way of ride height adjustment allows ultra-fine adjustment by 0.25mm increments, when compared with the previous 0.5mm increments utilizing eccentric bushings. Must be used with right rear bulkhead #373015.