I tried to figure out the difference with KYB with no luck, but NAPA also list three PN for the rear on a subaru.
71223SS: Extended - 17.375, Compressed - 11.25, Travel - 6.125
71222SS: Extended - 17.25, Compressed - 11.25, Travel - 6
71268: Extended - 16.75, Compressed - 10.625, Travel - 6.125
71223SS & 71268 both have a note that says w/o air suspension, I'm not sure if that implys that 71222SS is for air suspension but just so you know.
http://www.napaonline.com/Catalog/Result.aspx?N=599001+101988+50068+27853&Ntt=&Ne=25000&Ntk=Keyword