1951 Rear End Assembly

Nevada Hudson

Does anyone know what these numbers mean that are stamped in the pumpkin of my '51 rear end?

There are the letters, X,D, Z stamped around some of the nuts.

And on the other side  is stamped 12-14

And below that, 300304-S 

bobbydamit

Ask Doug , if anyone will know he should. Or direct you to who can.

He is at,   drdoug96@comcast.net  good luck, Bobby