I believe the advice to use an XC90 spring seat still applies to the S60 line, but I'm not sure about that.
Most folks recommend replacing the stock struts with 'upgrades' like the Bilsteins or Konis. You would probably have to order those if you decided to go that route and they cost a bit more money plus the added cost of shipping.
Depending on the mileage you might think about doing the strut bearings as well, though most people seem to think these last a LONG LONG time. FWIW my 1998 has 205k miles and the strut bearings actually seem fine (the spring seats are another story...).
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1998 V70 AWD->FWD Turbo 200k+
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