You must use the screw and bolt that included along with the original camera mount.

And the connection to the NavQPlus, as explained in is depicted in this image:

The lower chassis comes partially assembled with the side skirts attached, the side plastic attached, the PDB partially wired, and the LED lighting installed and wired. Remove screws that hold on the side plates and also the screws that hold on the top plate. The screws holding the side skirts and top plate on top will be replaced with Thumbscrews . KEEP these M3x5mm screws for attaching the MR-CANHUBK344 to the top plate later

The connection to the NavQPlus is shown above, and also explained in

You need to have mounted first the LED lights and covers. This step has been explained in this section:

HW ACCESSORY, and and

HW ACCESSORY,

PWA,

HW ACCESSORY,

(Hardware - )