Screws for MBX Mounting plate

Ridiculously, the ACW-513 mount kit does NOT come with screws to mount to the side of my MBX 5G. Does anyone have an idea of where I can find those? Or what the exact specs are if I am to find them the hard way?

The MBX 5G comes with a bag with a pair of mounting ears in the box that has screws - those should fit to secure the ACW-513 brackets to the MBX body.