Lower bulkhead with anti-roll bar mounting areas, fits front L and straight back R part. Redesigned to work well with the long arms and narrower suspension system holders. The bulkheads work an excellent low anti-roll bar mounting destination that enables the anti-roll bar cable to be placed directly under the drive shafts to somewhat reduce the CG. The bulkheads function 1mm milled grooves for the ball bearing hubs to maneuver the bulkheads 1mm nearer to your chassis center line from each part. Extra cut-outs were added for additional clearance to go the internal suspension system pins nearer to the guts line to give you maximum traction, steering, and balance. Made out of premium Swiss 7075 T6 aluminum, black colored anodized.