Oh - as to print sizes - the cibas do not have size dividers. likel the unidrums and sima drums I have. Other drums have dividers that can be adjusted, eg two 8x10's in a tube that normally only prints 11x14 with no divider ridges. You need something that keeps the paper close to the wall of the tube.
Look if you can find a store that sells used photo gear including darkroom gear. They are usually awash in these tubes in the used section.