Leaf spring brackets

[Ta6point6]

Long time reader, first time poster…

I'm in the process of restoring my ‘93 K1500 and when I sandblasted the U bolt brackets, there is an “I” and “0” stamped in the inside. Does anyone know what this stands for?

 

[Schurkey]

Inner bolt holes, and Outer bolt holes???

I didn't notice that when I blasted mine.

 

[Ta6point6]

I thought that also, but they are oriented front to back. Unless they meant inner meaning toward the center of truck and outer toward back.