Danish Couch

We found a great deal at the Salvation Army a few months ago and have had this project sitting for a while. Mr Modtomic has inspired me with, his similar project - Mr. Modtomic Couch - to post about ours. We found this great Danish couch without cushions. My wife will be making cushions for it, but we can't find anybody that sells the springs. We found a couple of leads online but they have all turned out to be dead ends. We have thought about using clothesline, or some vinyl coated cable from the hardware store. But, we would rather find the real springs if they still exist. Has anybody else had experience with this?

I think the couch has great lines and I have seen some examples online in much better condition selling for a pretty penny. I think we have found a good one, we just need to find the missing springs and get the cushions made. What do you think?