Help just found these in the rear end..

[Irishbleueyes]

What the hell is this?? They were under the pinion down in the pocket. My pinion was making noise so I pulled it apart to rebuild it and the pinion was loose up and down. Went to set the pinion depth and it was 1/2 inch loose in and out just like it was when I pulled it apart and thats when I found these shims of some sort. Two of them are a little crunched.. Anyone know what they are or maybe my 12 bolt is some early one off?? It is a 65