1994 T100 3.0L V6 5 speed manual

I now have a broken leaf on my right side ( the center leaf) rear spring. These spring have always been so bad not sure why it took 17 years to brake one. About 3 years ago I added some helper springs on the top. They did level things out at least but, it was not really a solution.

Can anyone recommend a reasonable replacement spring which will work so I can fix the broken one and get rid of the helpers? These stock springs are really weak so, others must have found a replacement somewhere.

The truck only has 125000 miles on it, everything works fine and I would like to keep it. There really isn't a like truck like the T100 any longer.

L