I've bought a 1999 Bessacarr E350 from a friend and it came with two sets of additional cushions - a set of four covered in matching material, one with a hinged wooden piece attached and another with a wooden bad on the back. The other set of two are covered in a plain grey material. One consists of two cushions sewn together at one end, and the other has a wooden bar on the bottom. My friend thought they were something to do with converting the double bed to two singles, but he had never used them and didn't know how they worked. I can't figure out how to use them either. Any suggestions?