Fastrax Derin Diff Halves / Outdrives For Losi XXX-S XXXS XXX-4 XXX4 - Fastrax FTXS17
These will fit the XXX-4 but are not as strong as the metal versions (but lighter)
Losi XXXS
Losi XXX4
Losi XXX-S
Losi XXX-4