The lightweight aluminum straight back bulkheads may play a role in excess weight savings. The bulkheads work a better ARS link mounting position enabling for greater modification possibilities, the horizontal orientation allows going the ARS link frontwards or backwards to enhance the rotation characteristics. The bulkheads utilize centering pins for easier placement regarding framework and for increased rigidity and determination. The anti-roll club mounting position keeps the cable club put straight under the drive shafts for an ultra-low CG. CNC-machined from premium & lightweight Swiss 7075 T6 aluminum not forgetting black anodized.