why would you even want threaded shocks off road?
the threads just get all clogged with dirt making them harder to adjust[:'(]
what can be simpler or quicker than just slipping a spacer in or out? no messing around turning the threaded collar a little at a time making sure both sides are the same- just whack in a spacer that you know is the same both sides & away you go!
plus the Kyosho or Mugen shocks are probably the best you can get
(not tried my XRAY shocks yet but they built up & feel very nice)!