Quoted from BagAJellyDonuts:http://www.menards.com/main/home-decor/furniture/casters-furniture-hardware/sliders-glides/2-3-8-concave-sliders-4-pack/p-1465092-c-13088.htm
These fit "over" the levelers. No adhesive.
I also have these under all my pins and video games. They work great. You can still nudge them, as they do settle in the carpet after a few weeks.