Ikea Billy height extension units (Leaside)

I have 6 Ikea Billy bookshelf height extenders to give away, beech in colour, 80 cm wide X 35 cm deep. Used but in good condition. They are as illustrated here, but the ones I'm giving away are beech and not white: https://www.ikea.com/ca/en/p/billy-height-extension-unit-white-80525278/