Wow, nobody has replied, sorry for that.
In my opinion many people swap out their leaf springs in their 1/2 tons for no reason, They may see it sagging one side or another usually caused from worn shackles and hardware. I just recently went through my entire truck's suspension and disassembled the springs to clean and paint them, they are just fine.
Bought some stuff from these guys and really like them alot.:

https://www.classicparts.com/Chassis/products/143/

Also like the Filling Station:

https://www.fillingstation.com/


1953 Chevrolet 3100
261 cu inch, sm420, 3.55 rear, torque tube still,omaha orange, still 6 volt, RPO green glass, side carrier spare, all done
In the DITY Gallery
Video of the 261 running

1964 GMC 1000
305 Big Block V6, sm420, the next cab off restoration