Yes, 52 GMC.
After doing a pretty good cleaning and checking of the spring hanger bushings, I probably only need to replace 1 or 2. I do see that the mounts that have the nut and bolt only have the threads on one side as the bolt has a shoulder. I will need to replace all the spring bushings though.
One thing I really enjoy about rebuilding a vehicle type for the first time is learning how all this stuff comes apart and goes together, and how much has changed over the years, and on this vehicle everything is standard,,no metric!