X4 reduced bulkhead. Features centering pins for effortless assembly and consistent geometry settings. The bulkheads feature a super low anti-roll bar mounting position which allows the anti-roll club cable to be placed directly under the drive shafts to dramatically reduce the CG. The bulkheads function 1mm milled grooves for the ball bearing hubs that relocated the bulkheads 1mm closer to the chassis center line from each side. This bulkhead fits front right side and backside left side. Made from premium Swiss 7075 T6 aluminum, black anodized.