I'm using a 2017 STI trans, RS180 rear diff, axles, hubs and knuckles...
Front knuckles should fit according to the thread I read as well as GR rear knuckles.
When I said hubs I meant to say knuckles. I'm not talking about changing out just the bearing hubs alone.
Also, the GR STI rear knuckles also fit the 2010 Legacy Outback...