You probably won't find them on line listed as 1950 Chevy 3100 seat springs. You'll have to look for them by size and wire diameter. Our local Ace store has a display of various springs but the selection is fairly limited. I bet if you googled pull springs or small coil springs & spent some time looking you'd find a source.

Save a life, adopt a senior shelter pet.
The three main causes of blindness: Cataracts, Politics, Religion.
Name your dog Naked so you can walk Naked in the park.