The lightweight aluminum rear bulkheads play a role in additional weight savings. The bulkheads feature a greater ARS link mounting position that allows for greater adjustment opportunities, the horizontal orientation allows for going the ARS link frontwards or backwards to improve the rotation traits. The bulkheads utilize centering pins for easier positioning regarding framework as well as for increased rigidity and persistence. The anti-roll club mounting position keeps the cable club placed directly under the drive shafts for an ultra-low CG. CNC-machined from premium & lightweight Swiss 7075 T6 aluminum not to mention black anodized.