I've never found (or seen) a color tag on my car, a Limited. SRT-6 only came in 4 colors I believe, Black, Graphite, Aero Blue or Sapphire Silver, they're pretty easy to figure out. Any proper body shop will use their color device (spectrophometer) to double check to get a paint match exactly.
Look here: 2005 Chrysler Crossfire Colors of Touch Up Paint