Valiant -64 7.25 rear spider gears do not fit

I ordered spider gear set from rockauto:
https://www.rockauto.com/en/moreinfo.php?pk=10111996&cc=1347858&pt=13932&jsn=883
But they do not fit. Side gears go in place without problem but spider gears do not.
It looks like there is no enought space to turn them in to place.
Service manual just states that spider gears should turn in place without any tool.

After better look it seems that new gears are bigger. At first I thought that old ones are only so weared out but even side gear diameter seems to be bigger.

Rockauto and summit catalogs both offers this kit for -64 rear end. What am I missing:wtf:


In picture new gears are left and old ones in right.

IMG20240415193502.jpg