I don't know of any "thrust washers" in the 55t other than the axle locking clips:
axle locks

Here's a diagram of the 55t:
http://chevy.oldcarmanualproject.com/shop/1955truck2/55ctsm0409.htm

All of the bearings & shims are available from a few vendors
https://www.justdifferentials.com/GM8-2-Master-Install-Kit-p/mkgm55chevy.htm

Last edited by Ott3r; 02/17/2020 3:19 PM.
'59 Chevy Suburban, NAPCO