Alero is gone but not forgotten
1999 black gls coupe R.I.P 130k
1999 auburn mist metallic gls sedan R.I.P
2005 Subaru legacy 2.5i 190k. New rims and tires for summer.
well look at it this way... If you replace something on one side...you need to do it to both...you don't want to have one tire hold firm on a corner while the other is rolling like a mofo cause the assembly is warn...
but no technically you don't need to replace your struts if all you need is springs, however if you can afford to you definitely should
I would be tempted to just use a quick strut on both sides.