This replacement set of top hats comes from KYB and is a perfect match to the OEM Subaru Spec B front strut tops for the Bilstein shocks. You'll want these to repair a worn Spec B, or to mount the Spec B Bilsteins (or aftermarket B6 Bilstein struts) on a non-Spec B Legacy or Outback. 

Set of two strut tops with nuts. Works ONLY with Bilstein struts. Will not fit with non-Bilstein struts.

Fits all 2005-2009 Subaru Legacy and Outback when equipped with Bilstein front struts.