This is a remix of the Magic Mouse Side grips by charlescho - which appears to have been taken offline now, here is a link to the original creator's profile on Thingiverse: https://www.thingiverse.com/charlescho/designs
His design was a bit too squared off so I added some curves to it.

This design will work on any version of the Apple Magic Mouse.

I also made two versions, one with a 25mm mating radius (25r), and another with a 30mm radius (30r) to accommodate different double-sided tape thicknesses. The one pictured in the screenshots is the 25mm radius version.

They are meant to be about 1-2mm away from the skids once glued so as to not touch the mat/surface when in use.