After dismantling our king-sized bed frame. I have left 24 sprung (in other words, slightly bowed) wooden bed slats.Each measures 75.5cm x 6cm. They are in perfect condition ...it was the metal bed frame that was causing problems. I've also got the plastic end caps that secured the slats to the bed frame, but they are frame-specific, so probably not much use except for recycling.
Anyway, if you have a use for the wooden slats, let me know.