1) Request 3 screws from support.ultimaker.com - get your ticket in soon.
2) They are M3 threads. I don't know about the screw heads but the thread and length are easily found in a typical Ace or True Value (but not home depot).
3) Also order them from mcmaster. They have everything. And it's quite cheap to order just 3 screws from them.
I'm sorry to hear about your difficulties; those screws are definitely going to be a problem. See my PM (via the icon in the top right corner of this screen).
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