If you mean the two differential thrust washers, about 2.2 mm thick, I bought them from Snyder's. Snyders also have thin shims if you need to adjust the rear axle position in the rear axle housing in order to get proper fit between the crown wheel and the pinion. I bought a couple of them too, but I did not need them.

Is one of your roller bearings badly damaged? In what way? I ask, because I had no bad damage on the the roller bearings, not even on the left side which had extreme wear on both the outer races and the surface on the axle half where the roller bearing had grinded/milled the steel splinters from the crown wheel and the pinion into thin flakes.

The roller bearing on your pictures seems to be in good condition.

The 2976 is the number for that outer plate only. . I would try Gary Wallace 314-293-1991 https://earlychevyparts.com/.. If no luck and you can get a part number a company called Easy Bearing 717-568-8800 Daryl . Good luck.

I'll give Gary a call. Thanks.

The rolls are loose and seems like they will jam.

@per-ake-larsson it is the bearing on the left side. The rollers are loose. I have the thrust washers from Snyder’s and a couple of shims. I just need to get a couple of more thicker shims to help limit the back lash.

@michael-mcdonald On your pictures the rollers seems OK to me. My rollers were very loose when they were not installed, and I think that it is not a problem.

Are the rollers loose also when they are installed between the axle shaft and the race in the axle housing? If so I guess that either the axle shaft or the race or both are worn. Are the rollers worn? The diameter on my rollers was 12,7 mm (.5 inch)

@michael-mcdonald I won't claim to be an expert on that style bearing but I do have 4 Hyatt bearings of the same style and the rollers are "as loose as a goose" . I think to properly check them they need to be installed . I did not measure but it appears the side end play could be about .030 but the contact between the roller inner diameter and the "pin" that holds it in place is much more. The pins are there I believe only to keep the rollers separated.

@per-ake-larsson I was able to get another bearing  from Gary Wallace it is used but he said it is ok. Should be here on a couple of weeks. Thanks Mike

@steve-d Gary had a used bearing I purchased it and it should be here in a couple of weeks.  Thanks for all your help. I will post again once we start back on the adjustments. We have to get rid of some of the back lash with shims as well.