Just FYI and to clear up any confusion (at least I had). The Subaru website now lists the 20 mm rear sway bar for the Legacy. It IS the same part number as the XV Crosstrek listed above however. Hope this makes sense.
I'm wondering the same thing. Want to run a winter/summer set-up. Anyone out there 'been there, done that?' I'm specifically wondering about how to program the sensors to be read by the car. Dealership? or can any place (like Pep Boys) do them?