These rubber mount modules can be mounted on the adapter plates of MCE holders, to better protect your device against vibration.
With the ZUMO 396 you also have to create the required distance, for the cable outlet. The solid sleeves of 10mm height, are already sufficient for this.
The rubber dampers /mounts, have a height of 15mm or 10mm (smartphone).
The screws go into the internal thread.
NOTE: If necessary make a note, if you use a lock, so we can deliver the set of screws in the correct length.