the ones the fix the motherboard to the standoffDo you mean through the motherboard into the stand off or the standoff into the case?
The bolt is M1000
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Usually I just go through my box of PC screws, I have zip bags of each type, it's usually one of the two types of machined thread.
Some PC screws are the "self tapper" type like the fan, case screws or another ones have, can't recall 2.5/3.5" HDD.
AHH I see you need the whole lot. Seems it will be either M3 or #6-32