Wanted to create a set of storage dividers to more easily access smaller components - like little Lego Technic parts. I started with a straight panel, and provided a couple of others with tapering which help pull them out one by one.

They will probably fit most smaller storage drawers, which all seem to have similar dimensions - in this case 50mm wide by around 35mm high. I bought a cheap Raaco unit off Amazon. They seem to work fine.

I found that friction alone kept them in place but even drawers in the same unit vary. If you find them slipping upwards a dab of glue to hold them down will help. You can use one with the one sided tapered with a dab of glue against the end of the drawer to make things easier to pull out without dividing the drawer at all.