X4 reduced bulkhead. Feature centering pins for simple create and constant geometry settings. The bulkheads function an excellent low anti-roll club mounting position that allows the anti-roll club cable become placed directly under the drive shafts to dramatically lower the CG. The bulkheads function 1mm milled grooves the ball bearing hubs that relocated the bulkheads 1mm nearer to the framework center line from each part. This bulkhead fits front side left part and rear right part. Produced from premium Swiss 7075 T6 aluminum, black anodized.