a good spring shop will make you any new part for a leaf spring
bring them the old part, they have stock spring material in all thicknesses and widths to make any shape your heart desires.
special tooling allows then to heat and form a spring eye to any diameter

they can make you a whole new spring assembly or they can rebuild the existing spring assembly and replace only worn leaves and rivet/crimp it all back together for you
the sky is the limit
-s