A spring shop will make a new leaf or the whole stack from scratch
A place just 40 min from me said they prefer to work from a pattern seeing the original one to get the knuckles just right but could also work with just a description and measurements.
This same place informed me that the front springs for the 1 ton are no longer a stocked/order-able part in North America
I suspect pretty much all shops have the same few suppliers and if their catalogs don’t list it anymore it can’t be ordered
So our only choices are, get one made, find one in a junk yard, hack a home made solution from some other spring that is close enough to work... but I don’t know about that last one as I’ve never found a suitable replacement.

If anyone has more insight for this spring please let us know
Because I’m gonna need a couple more soon as well.
But I’m happy getting new ones made because the price I was quoted seemed reasonable.
Thanks
-Stan