Well, it looked like you needed help pretty badly so I got to work on the info you needed... Now this is off the 12L, not the 12LW, but I'm pretty sure the diff configuration stayed the same. I'll check this out to be sure tomorrow since my 12LW isn't easy to get to right now.
In this photo you see all the parts with an extra cone washer to give you an idea of what it looks like from both sides. I had drilled hubs and used notched diff rings, I'm not sure if the notched diff rings are even still available. If not you'll want to get a super fine grit sandpaper and glue the diff rungs to it then cut them out with a hobby knife. The other option is to superglue the rings to the hubs, but that makes for a lot more mess when you go to change the rings.