04 outback half shaft seal?

[junk]

I'm pretty sure I caused myself big trouble here, but I'll ask anyways. I rebuilt this car from a wreck. Anyway when I was rebuilding the car I removed the front cv-shafts. Little did I know that you are supposed to remove the roll pins VS just removing the cv'shaft & the stub shaft from the front differential. When when I pulled one of the cv-shafts I ruined the seal on the side of the differential. So how do I replace this seal? It is pressed from the inside to the outside. There appears to be a cover that you can spin off & replace the seal & then reinstall the cover, but I'm assuming the cover helps setup the front differential. How do I replace this seal? The seal is junk, so I have to replace it.

Thanks
Jeremy Oliver

2004 subaru Outback wagon 2.5, Auto.