Stock bolts are fine unless you're clumsy, but I don' think there's anything weird about the size so knock yourself out with Unbrako 12.9 screws from your local hardware shop if you like, they are far stronger than necessary.
Stock bolts are fine
Park Tool torque wrench Allen keys + shimano pinch bolts = PITA.
@Adhiero started
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Stock bolts are fine unless you're clumsy, but I don' think there's anything weird about the size so knock yourself out with Unbrako 12.9 screws from your local hardware shop if you like, they are far stronger than necessary.