Ah, Lowe's, my SECOND hobby shop.
Did you get the nylon bolts at Lowe's? They have several sizes. The steel bolts will work, but they won't break like the nylon ones.
Just a note, if you break them, and can't get them out, use a hacksaw blade, or dremel, and make a new "slot". If it's broken off inside, and you can't do this, then heat up a screwdriver, and make a new slot,- carefully,let it cool, then use a screwdriver to remove.

Jetts