Junk yard,
Did you ever resolve your bearing issues. I have a spare box 902 early laying around with no gears, or shafts but with good bearings, let me know if you interested, and I can take some pics..
Also check this link on the flipping the diff. Do you have a late 901/911 box?
http://www.germanlook.com/Forums/showthread.php?t=9153
If you still need more pics let me know
Alex