CNC-machined LEFT straight back bulkhead made out of premium extra-strong Swiss 7075 T6 aluminum, black colored coated for long life and trendy appearance. Strategically machined for reduced fat while retaining energy. The small straight back bulkheads including the top bulkhead clamps are dramatically reduced and lighter, supplying ultra-low CG for the straight back suspension. Designed for very quick & simple ride height modification. No further hassle to dismount the auto to alter a corner trip height! The included ride height shims are placed between your bulkhead and upper bulkhead clamp to change ride height: smart & effortless. The new means of ride height modification permits ultra-fine adjustment by 0.25mm increments, in comparison to the last 0.5mm increments using eccentric bushings. Can be used with right rear bulkhead #373015.