I just rebuilt the original hubs on my 1970 K/5 Blazer a few weeks ago. I was fortunate to locate a pair of NOS clutch ring assemblies on EBAY.
The inner clutch ring is 3937062 or Spicer 23347X. A search on EBAY will have a few pop up brand new.
The outer gear is 3937061 or Spicer 23346X, and is still available here:
https://www.gmpartsgiant.com/parts/g...f-3937061.html
OR here:
https://www.ebay.com/itm/27618001402...Bk9SR_6CjNTbYw
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1970 K/5 Blazer CST 4WD, Bronze, 93k ACT. miles, 350, 4 speed, positraction, 16.5" x 8.25" wheel option, tilt, tach, vacuum, AM/FM, manual throttle...Dad ordered and purchased new 4/70. Currently frame off restoration in progress...
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2017 Sierra 1500 SLT 4WD, Black, 41k miles, 5.3, 6L80E, 3.42 LS, 20" polished wheels, everything but moonroof and 6.2...
2019 Canyon SLT 4WD, White, 60k miles, 3.6, 8L45, 3.23 LS, 18" wheels