Cushion / foam (Abraham Heights LA1)

I used to have 2 fold out foam 'Z chairs' (probably from MFI !!) that turned into single 'beds' to sleep on.
The bases are long gone but for some reason I kept the parts that formed the chair backs.
As you can see they are slightly pyramidal in shape, and are foam filled with covers that will unzip for washing. They're 25" long, 11 " deep and 9" high at the highest point.
I thought I'd chance them on here rather than the tip - one never knows!