HPI Differential Case. This replacement differential case is intended for the HPI Trophy Truggy 4.6, Vorza Flux, Trophy Buggy 3.5, Trophy Truggy 4.6, Trophy Buggy Flux, Trophy Truggy Flux, Vorza Nitro Buggy, Vorza Flux Buggy, Vorza S Flux Buggy, Vorza Nitro Truggy, Vorza Flux, or Vorza S Flux. Package includes two differential halves and two swaybar caps.