X4 high quality reduced bulkhead. Improves durability in hard crashes. Features centering pins for simple assembly and consistent geometry settings. The bulkheads feature an excellent low anti-roll bar mounting position that enables the anti-roll club cable become placed directly under the drive shafts to considerably reduce the CG. The bulkheads function 1mm milled grooves for the ball bearing hubs that moved the bulkheads 1mm nearer to the chassis center line from each side. This bulkhead fits forward right side and backside left side. Made from premium Swiss 7075 T6 aluminum, black colored anodized.