The lightweight aluminum back bulkheads may may play a role excessively fat cost savings. The bulkheads work an improved ARS link mounting place allowing for greater modification opportunities, the horizontal orientation permits going the ARS link frontwards or backwards to boost the rotation characteristics. The bulkheads use centering pins for easier positioning regarding framework and for increased rigidity and determination. The anti-roll club mounting place keeps the cable club put right beneath the drive shafts for an ultra-low CG. CNC-machined from premium & lightweight Swiss 7075 T6 aluminum not forgetting black colored anodized.