Rev D Legacy wheel bearing

There's a wheel bearing gone on the front of my rev d legacy and i'm not sure what exact part i need to get. I had the hubs from my old wagon but when meself and Sean (B4 Soon) went to swap them, it turned out the Rev A hubs had a different ABS system. This is a pic of the Rev A hub



The ring with the notches isnt on the Rev D. So, I now have to spend some money so do I need to buy the hub or just a bearing kit and could someone point me in the direction of where to buy?

Cheers

nearly sure that 00-> impreza wrx is the same stub as B4 rev D.