Probably not correct,but found his with searching for sh1ts and gigs.
http://www.autopartswarehouse.com/sku/Subaru/Outback/Bilstein/Shock_Absorber_and_Strut_Assembly/2008/XT_Limited/4_Cyl_2-dot-5L/W0133-1831358.html?loc=Rear&tlc=Brakes%2C+Suspension+%26+Steering