Customizable Keyboard  Leg/Foot by ccox on Thingiverse: https://www.thingiverse.com/thing:2132775

Summary:
If necessity is the mother of invention, then broken parts are the mother of Thingiverse uploads.The included STLs are for 3 of the keyboards I had in my office.And you should be able to customize the design for many other keyboards if you have calipers handy to measure the existing leg/foot.