Logitech K200 8-degree Folding Foot RunnerPack
It's a foot/leg for the keyboard in the product name (and possibly other keyboards from Logitech or other manufacturers). It should work on either side. I added some silicone (caulk) to the end to keep it from sliding (the original had something similar). I hope you find it useful.
This work is licensed under a Creative Commons Attribution-NonCommercial-ShareAlike 4.0 International License.