Rivets for mounting the valence to the Grill

Your '69 Dart has a valance? I have no idea what you are refering to.

Anyways, look in the McMaster catalog. They have every type of rivet/fastener known to mankind:

http://www.mcmaster.com/#rivets/=yh984e

Thanks Man!
Yeah, although Valence may not be the correct term for it.
The grill is made up of two pieces. A Top section is the grill screen with a bottom piece riveted to it. I'm calling the bottom flatter section a "Valence"