Replacing chair spring?

Leather swivel recliner with broken sinuous spring. Measures 17" out but the ones still in measure 19" stretched. What size do I buy and will a
trampoline spring puller suffice to stretch it? Have looked at a few YouTube clips on this but they are all for attaching to wooden frame, this chair has them attached to a tubular metal frame with canvas type loops holding the springs.
Kenny Cargill
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