On the front you need to stay with the same ones as stock. You can go to a longer shock on the rear, but be cautious as to the travel. Sometimes the travel is just moved down, not increased. If you have not added bumpstops to limit upward travel, then you could bottom out the shock under compression.
Kary


1987 Mitsubishi Pajero "Modified"
The other original Mitsu brother
Northwest Trailmaster