hello! I have a 2005 legacy GT wagon with the 5EAT transmission. I recently went through the process of replacing some corroded drive train components as well as making the switch to bilsteins, and during the process my mechanic noticed that the rear differential is pretty corroded and needs to be swapped before too long. We both assumed it would take an R160, but when they went to check it out, the told me the installed diff doesn't look anything like the R160 you typically see on the sedan/outback.
I searched and was unable to find conclusive info about rear diff compatibility -- can we use a standard R160? If not, what part do I need?