Also if you have one already and just looking for a replacement, post a picture up. Should be able to tell if it's imperial or metric just from that

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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the ones the fix the motherboard to the standoff
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.
the ones the fix the motherboard to the standoff
AHH I see you need the whole lot. Seems it will be either M3 or #6-32
nope same, they fit but when your try to nip them up you can feel them slip.
do you get an m3.5?