Redesigned front/rear diff bulkhead block set produced from tough, rigid composite material. Strengthened for better bearing seating and enhanced tightness with this differential and pinion. The bulkheads would be the mounting point for all suspension system elements. The universal design allows the diff bulkhead block become mounted at either front or back from vehicle. Comfortable use of both front side and back differentials makes upkeep quite simple. Fits XB808.