60,
I'm not in front of the truck right now, but I assume they are not pop (or blind) rivets, but more like the ones that hold the front turn signal lense to the housing?
If so, then they are regular rivets as used in the airplane industry- they fasten with a tool like this
http://m.skygeek.com/aircraft-tool-s...FZdWDQod2RoK1A
B