Sorry, I should have been clearer. The mini joystick that comes with the upgrade is what i'm referring to. You can order that separately, for replacement's sake. I just ordered some from the link he provided, to have backups, if the mini joystick breaks on me. Here's the link, and the reason I replied to your post is because i've tested that thingaverse design with the mini joystick and it fits well, if you decide to print one out.
https://tech.alpsalpine.com/prod/e/html/multicontrol/potentiometer/rkjxk/rkjxv1224005.html
Hope I helped... lol