X4 paid down bulkhead. Feature centering pins for simple make and constant geometry settings. The bulkheads function an excellent low anti-roll club mounting spot enabling the anti-roll club cable be placed right in drive shafts to dramatically lessen the CG. The bulkheads function 1mm milled grooves the ball bearing hubs that relocated the bulkheads 1mm nearer towards the framework center line from each component. This bulkhead fits front part left component and rear right component. Created from premium Swiss 7075 T6 aluminum, black anodized.