I swapped my broken drivers side springs with the springs in the middle of the seat. I did a few repairs to the broken spring the best I could. It worked in my case & didn't need to shop the internet. I think my seat was in a bit better shape though. Good luck!

1959 3100, original 235/3 on the tree w/overdrive. Carter YF 2100S carb, 205/75/15 w/front sway bar