Shock absorber selection is related to your vehicle use, if you are mainly a highway user then you have a couple of options - (1) stay with the factory standard issue shocks and springs - (2) You may want to consider upgrading to OME (Old Man Emu) shocks & springs, they originate from Australia and come in many different heights and ride options. In my humble opinion a big improvement on original equipment.
Regards
David
1998 LX450
1997 Landcruiser