I would ask the upholstery shop if they have suggestions. Even if you buy fabric at a discount store, a specialty sore might help you. I know that sometimes they aren't needed. My mother recovered my father's Packard seats by retying, as she did with a very aged sofa. Most of the time, they aren't ruined, just pulled apart. Heavy grade twine between each coil and then sort of webbing will often salvage the old ones.
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