License Plate Bolts?!

I am having a heck of a time getting the correct license plate fastening bolts. I tried everything that walmart carries to no avail. I called the local Isuzu dealership, and they told me that they don't have that part or the information to the bolt size. Can anyone tell me what bolt to go get at the local hardware store?

I figured it out... 6mm 1/0...
Ace Hardware is where I found 'em.