Help With Leaf Spring Construciton Details

[1project2many]

I am working on a project which involves replacing individual leaves in a spring pack. Spring pack information comes with notes such as:

Spring Construction:1st Stage 1/423 1/380 1/323 2/341, 2nd 1/1.063

The numbers refer to the individual leaves in the spring pack. But what do they mean? Do they tell me about the length? The thickness? Resistance to flex? Secret code requiring Magic Decoder Ring?

[1project2many]

Still looking. In some listings these are decimal values. It seems like they might be the leaf thickness values. But it seems like making the leaves out of mildly different thickness steel would add cost and complexity, and 2) the spring pack thickness doesn't match leaf thickness. Still looking...