[aviatorsman]

This won't help much, but I *think* different leaf spring manufacturers may use different diameter center pins; but they all have the same size 'head' for the spring perch. I ran into the same problems finding a replacement when I snapped the pins on my YJ when I sent SOA.

If it comes down to it, you can use a regular hex cap bolt and grind the head into a circle, or use a allen head bolt, I cannot remember which size works off the top of my head.

good luck.