Fresh Air Door

This post inspired me to copy what I saw here. Using a Dremel with the cylindrical stone, I ground off the inside of all four rivets and punched them out. I can figure out how to mount the hinge plate to the box (really big holes there) but what type of rivets do I use so the plate still moves open and shut? If not for you guys and this forum, my 68 Barracuda would just sit