I searched but couldn’t find anything, I can find plenty of M4 bolts with a 3mm driver hex head. But all the 2.5mm driver hex heads seem to be rounded button style heads.
Anyone found a good M4 bolt selection kit that has the same shaped heads as snapmaker stock bolts AND with 2.5mm hex driver head. Oh and also includes 10mm which so often seems to be missing from the kits on Amazon.
If not, snapmaker can you do a supplemental bolt kit?
No, will look, found them on grainger but would have to buy bag of 100 of each length 
I pretty much have to sign over a portion of each paycheck to McMaster-Carr. Like alimony 
BTW I checked Bolt Depot, and they use 2.5mm for the flat-head M4s and 3mm for the socket-cap. Presumably, you’re looking for the socket cap.
yes, my OCD demands all the bolts look the same 
For anyone else looking - I think the main distinguishing feature is the ones which come with the Snapmaker 2.0 are low head height (compare side by side vs. some regular M4 socket caps). This type, although still less common, do seem to be available with 2.5mm allen key heads rather than the standard 3.0mm.
I’ve ordered these and will test out;