Hi - Your pictures aren't very clear, but I would venture to say that they are TORX screws. Is the indentation on the head a six pointed star ? If so, then they are Torx screws. I'm assuming that you know what slotted and philips head screws are.
If the indent is six sided ( hexagonal ) but not star shaped, then they are ALLEN head screws.
Both are available with a bit of searching. ( Google is your friend. )
I would also guess that they are metric screws. As long as the diameter, length and
thread pitch are the same, it won't matter what the head type is as long as it screws in correctly.
Have you emailed the manufacturer, asking for replacement screws ?