Yes, you can store your ScrapRack Spinders in the Expedit, they can be stored standing up or laying flat. I have a couple of Spinders with extra pages on them that are in one of the cubes.
The Dividers are a little too large and will curl up on the edges if you try to cram them into a cube.
The Casters that are shown in yesterday's post are part of the system and designed to go on the cube system. IKEA only recommends using them with cubes that are 1 or 2 cubes high.
As far as I know, all of the IKEA stores carry the EXPEDIT System and it is available to order on line.
Thanks for reading today's post!