Replace 1 spring or both?

[Andrew Duane]

My mother's 1997 A4Q has a broken rear spring. I'm getting an estimate
on replacing it with a used one from Chris at Force5 Auto, but the
mechanic mentioned that it might be best to replace both because of
sagging. If I was using a new spring, that would make sense. Would it
also if I was getting a similar vintage used spring? BTW, are the right
and left rear springs the same part?

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Andrew Duane             Juniper Networks
978-589-0551             10 Technology Park Dr
aduane at juniper.net       Westford, MA  01886-3418