This clicker measures at 36mm in diameter and approx 25mm tall with the clicker installed.  I used a green click that I bought off Amazon.   

Note, it is never a bad thing to add a drop of glue to hold the keyboard switch in place.

Big shoutout to HL ModTech whose YouTube videos on Tinkercad and how to design a clicker were simply the best tutorial videos I have ever come across.   Find him on YouTube or Patreon… you will not be disappointed.