I re-did all the springs in a bench seat for my 64 Tempest. I really didn't have much to work with in the beginning. The foam was terrible and the cover over the driver seat was non existent. I was really concerned about the springs being too weak as I would about hit the floor. With no foam or cover I would bottom out on the bench. I added tie wires across the spring and put in zig zag helper springs along the sides.
What I learned is the vinyl and foam make a huge difference in how stiff the seat is.
I had to remove all the helper springs. The seat is still very firm.
My advice is just make sure you don't have any broken springs. If you do repairing them isn't all that hard.
So
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