Seat Spring Repair or Replacement?

I see rear seat bottom from vert. Mine has no actually broken springs but several are rusted thin, to the point of worry. There are web vendors who sell springs and things.
You can rebuild it with donor materials from another.
I tried hard to work a deal with a guy who had practically NOS for my 67 vert stored away. After he pulled them out, sent pics, etc.., he stopped communicating. So I went back to plan A ; Use the super nice notch back seat bottom I have here for its springs and other good materials. Only welding will be patching the upper perimeter frame and 1 lower rear corner.