You should get extras if you are placing an order with Vans. You will strip a few every year during annual inspections, and will thank yourself for keeping a small supply on hand.
I keep a good supply of all the common sizes (100-200 of that size), but I seem to be the 'go to scrounge supply house' for such things for local RVers.
I generally always have a range of AN515, AN525, AN507, AN509 sizes in CAD & SS screws that suprisingly needs regular re-stocking...
built a few RVs, rebuilt a few more, hot rodded more, & maintained/updated a big bunch more