Yep, OBS=outback sport Impreza. And I have an OB, or should it be LOB? I have no idea what the 3.9 rear diff is from, but it's flange does not match an Outback driveshaft.

And come on, Chuck. You're the big man on the forum these days.

Edit: Apparently I'm an OG now. I guess I should know these things.