The rear emblems suggested list price is $109.00 for silver VIPER RT/10 and $88.80 for DODGE - both for the rear fascia. Of course VCA members save 15% and Venom members save 20% on those prices.
Mopar is not showing stock on the silver side badging for any years, including those that used it on Steel Gray or Graphite cars. While we don't have an RT/10 handy to compare to be sure, it may be possible to use the same silver VIPER RT/10 rear badging on the sides. It may be a little smaller (we will try to check this weekend in person), but the style appears to be identical.
Hope this helps!