Older car trunks had spring steel rods in them. If you can find the older 70's and 80's they are longer. Hit up a salvage yard you can usually get them very cheap.Boy, was I wrong about that. Turns out, SS is not as common as I thought. Couldn't order any unless I wanted to buy a truckload. Obviously, I don't need that much! Junk yards it is, I suppose!
It's a specialty metal. I work for a specialty metal distributor and even they don't carry it. I did find a couple distributors, one in Chicago area, one in Detroit area, as well as Alro, and they all laughed when I told them how much I needed. It can be obtained, but it's pretty much made to order. So, unless you are buying a flatbeds worth of steel...I've been buying sheet metal from a local steel shop here in Detroit area for past 20 years. A couple of years ago I went in to see if I could buy some Spring Steel rods from him & surprisingly he had no clue or idea what I was talking about & never heard of it? And this is a huge wharehouse full of different shapes & sizes of steel? LEON.