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Original springs can be re-tied, adjusted, transferred from one side of the seat to the other, and replaced. I believe when my seats were restored, all four of these options were used.
I rebuilt my bench seat. I bought a roll of zig zag work g material, some straight stock, and clips to connect the new to the existing. You can see my step by step process by going to Abe's 54 Rebuild Thread. Lots of pics.
This truck (55 F100) belongs to a friend of mine. The upholstery work was done here in El Cajon at Friendly Upholstery using Ultra Leather material. All of the contouring was done over the stock bench seat springs. I use these photos to illustrate how much a stock seat can be modified to look custom with some imagination and an upholstery guy who can shape foam.