And these stud sets:
Or try here.
Onyx is more common. MOP is more understated. Depends on what you're going for, what you want to convey, but both are good choices.
ANd KW studs pair with either black or white.
Meermin is goodyear welted; SuitSupply is Blake stitched. If I go with the SuitSupply pair, I'd make sure they have silk laces in them (I could be sure from the picture).
Otherwise it comes down to fit.