Need specific type of screw for K1C Extruder/motor (black, hex, etc)

During some maintenance, it appears that my son has lost the (3) screws for a K1C extruder/motor and I would like to know the specific type/etc in order to order some replacements.

These are black and short with a hex head (see attached image).

Best regards

It’s an M3x8 or 10. Most if not all the bolts/screws are M3 on the K1C.

Mine measured M3x13