CNC-machined LEFT back bulkhead crafted from premium extra-strong Swiss 7075 T6 aluminum, black colored coated for long life and stylish look. Strategically machined for reduced fat while keeping energy. The small right back bulkheads such as the top bulkhead clamps are significantly reduced and lighter, providing ultra-low CG for the back suspension system. Designed for very quick & easy trip height modification. No further hassle to dismount the auto to alter a corner journey height! The included ride height shims are placed in the middle of your bulkhead and upper bulkhead clamp to change ride height: smart & effortless. The brand new method of trip height modification permits ultra-fine adjustment by 0.25mm increments, compared to the final 0.5mm increments utilizing eccentric bushings. May be used with right back bulkhead #373015.