The drink holders seem way too big in my 2015 Highlander allowing drinks to tip over. I purchased it used, so maybe I am missing something that came with the vehicle. This print has worked out nicely for me.  I secured it with some picture hanging type materials, it might be fine with nothing. It is sized for 81mm containers which is the largest I have (Owala shown in the pictures). You can download the opensource software OpenSCAD if you want to modify the diameter. Just load the file and follow the directions at the top.