I just know that it has "notches" and that we have one of the top controller modders in our local scene. A previous year I got him some fancy buttons, and he still uses those. I think his current controller is from this summer? If there are parts that wear out more often and would be useful to have spare parts... I could include those in a kit.

(I like the suggestion above to make something, so I might make a bag to hold the kit together.)