X4 reduced bulkhead. Feature centering pins for easy set up and consistent geometry settings. The bulkheads function an excellent low anti-roll bar mounting position that enables the anti-roll club cable to be placed under the drive shafts to considerably lower the CG. The bulkheads function 1mm milled grooves the ball bearing hubs that relocated the bulkheads 1mm closer to the framework center line from each side. This bulkhead fits front side left part and rear right side. Created from premium Swiss 7075 T6 aluminum, black anodized.