This is one place that has them. The link is to the beginning of the pages that have various Mopar badges, in case you want to get script Challenger insignia, too. The DODGE letters are on page 3. I might also have to figure out how to put together different HEMI hood insignia to produce a 346 HEMI badge, since this IS America (no metrics for me, thank you) and they don't seem to have the numeral 5 to produce the more correct 345 badge for the R/T version of the new Challenger:

http://www.herbsparts.com/products.asp?cat=14