1954 F100 bench seat springs - Sources of supply?

[tquigley]

I have a few zig-zag springs in the bench seat cushion that are broken or missing. I have found furniture suppliers who have the zig-zag springs but not the long reinforcing stabilizing springs that are part of the system. Any suggestions for suppliers of such unusual items? An old seat spring would be ideal to cannibalize. Beyond that, i have no idea how to solve this unusual problem. Any advice out there?