The last 5 (or 6 if it were to go above 99999) digits of your VIN is basically the production number. Yours was the 47,469th Crossfire built since the Crossfire's inception back in 2003 for the 2004 model year.
We are trying to get a handle on as many SRT6s as possible to keep track for reference and collectibility potential, etc.
One of our forum members has one of the first SRT6s and one has the last (from all of the data collected so far).

Forum member SRT SIX keeps track of all of the forum members' SRT6s and I gather info from other sources (ebay, cars.com, etc.) to get the bigger picture.