Well a look at my FSM shows two options for shocks.
1. Standard - Hydraulic, cylindrical, double-acting
2. Optional -Hydraulic, cylindical, double-acting with low pressure nitrogen gas. Then it lists Hard, Medium, and Soft specifications.

There's no way it seems to tell what's on there now from the VIN # or chassis #'s. I think there was an electric suspension adjust option on my year? I did not have that. How do you adjust the 3 way shocks, especially the rears?

92 Montero LS 3.0L V6 Auto, Stock, Original owner, 185,800K miles