Hi there
 I purchased springs from Eaton Detroit for my 56 F100, expensive, then got them shipped to UK! 
But whilst looking for springs came across this place.  I know nothing about them but they may be worth investigation.
https://www.generalspringkc.com/Leaf_Springs_Ford_F100_1942_1972_s/1863.htm 
stuey
 

I put new springs in my 56 Crown, I took a spring off my car and brought it to a shop that made springs for heavy trucks. The guy there asked me what the spring was off of, took a look at my old one and told me to be back before 5 pm. He charged me $300.

Lou, what exactly are you trying to say? I do not understand the point you are trying to make. Are you saying that he
made new springs? Pete

I think he's saying that he took an old spring to a spring shop and they made new ones.

re arching is a very cost effective way to do it, if the old springs are in good condition.  The problem is that most original springs from a 60 year or so old vehicle are pretty badly worn and need to be replaced.


Lawrenceville, GA

Yes the truck shop made new springs.