ESB Armor grommet mounting (armor screws / nuts size)

viewoptic

BFB Hero
I saw this info somewhere prior but cannot locate it, what is the correct size for the plastic screws / nuts used for the accurate armor grommet mounting method to the vest?
 
I haven't done mine yet, but I believe 12 mm is enough, but maybe 15 mm to be safe and you can always dremel off the excess?
 
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