I have no experience with the fourstrokes, but I would be very surprised if the 03-04 models uses other sprockets than the 06 model.
However, everything is documented in the parts lists, so you should be able to find out if the sprockest have the same part numbers between the years.
http://www.gasgasmotos.es/en/manuals/models-2-2006.html
__________________
Anders
"So you know, that you're over the hill when your mind makes a promise that your body can't fill" (Little Feat: Old Folks Boogie)
2015 EC200 Racing: TE bars, Rekluse Core Exp 3.0, 38mm Lectron & Ohlins S3 steering damper
2006 EC200: 2011 plastics, Rekluse Z-Start, revalved KYB forks & Scotts steering damper
1998 Bimota Supermono
1986 Duc Mille S2
1975 Guzzi sidecar hack
1961 Morini Corsaro 125
etc
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