Bookend for Ikea Bookshelf

I noticed some of my books were bulging out from the ikea bookshelf, which probably isn't very good for the books. These bookends provide support, with one for shorter and one for taller books. Can't remember the name orf my bookshelf, but if the distance between vertical slats is ~122mm it will probably work on yours. You might have to shrink/enlarge the print it depending on how you put it together, I found my print fitted three of the shelves but not the fourth - I blame whoever assembled the cabinet (me).