I replaced the driver's seat bottom and back springs on my 64 a long time ago with reproduction springs that were available at the time. I hope they are better these days as mine never felt right. The bottoms were okay, but the backs stuck out forward at the top into your neck. Tried to correct it with tie wire, but was never right. Ended up getting and replacing an original spring for the back and it was much better. Maybe think about just replacing the bottoms, as they do the most work bearing our..... weight. I do believe that these seat springs were soft from the factory and likely get worse with age. As Rohrt stated, you can use the foam to stiffen them up a bit and make sure you don't have broken springs. Good luck.
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