With the yj springs you are basically trying to "restore" your ride and height. Other springs will work but you'll more than likely gain lift and possibly alter your ride quality. All depends on what you are after. I wondered about using the main from rear XJ springs but they are usually worse and flatter than the POS's that are on YJs. Good luck.
'89 YJ (MC Carb, Nuttered, 2.5" OME lift) & '98 4.0L ZJ (2" BB,KOR Rad. Support, 31" BFG 's)