I never owned a WRX. I was really lucky when I broke down in that I found a shop that specialized in working on Subarus and the owner had actually imported a few from Japan himself.

My car was the Legacy GT-B and thus the NA Legacy Outback rad wouldn't fit but the owner thought that the WRX Sti one would and lucky for me it did. He put that rad in the car and it worked and got me back on the road.