After my Givi top box bungs fell out, I created one.
I initially printed it in PLA, but thought a little give would be better so printed it in TPU.
I printed it at 30% infill and it is working well (outside of the purple colour).
I have increased the size a little to form a snug fit.
You can get the original design to adjust at:
https://www.tinkercad.com/things/2ggrRth6ytU-givi-keylock-bung
Givi_Keylock_Bung.stl | 421.3KB |