need help.mounting emblems!

Don't know exactly what they are called, but there are these little "tubes" that have a flat rim on one end. The tube pokes through the fender hole from the outside and the rim presses against the fender surface to keep the tube from slipping all the way through. Then you simply push the emblem's pins into the tubes and they basically stay in place with a friction fit. I found mine at a paint and body shop.

Au-ve-co Products makes them in various sizes and I think they are called tubular nuts: http://dixied.com/store/product2595.html
You'll have to determine the hole diameter, pin diameter, and length to find the correct one.