I'm pretty sure they fit, there was an earlier post on it
http://legacygt.com/forums/showpost.php?p=3324480&postcount=183
I looked into them years ago, gave up only because I got lazy with trying to reach a Canadian dealer to order them from.
After the Yakima Railgrab didn't work out for me (see my earlier posts on this thread)...I settled for these:
http://www.prolineracks.com/mont-blanc-3700-aero-wing-crossbars.html
...which aren't as low profile as the OEM Canadian units...but have served me well. Fit is great and with my moonroof open, a bit less noise than with the round Yakima bars I used to have.
I noticed that Yakima now has these, and according to their site, they are compatible with the 4th Gen wagons, but double check them:
http://www.yakima.com/shop/rack-systems/factory-tracks-or-rails/whispbar-s41-rail