carb jets 400ex ????

[ATL1100]

changing bike back to stock. have changed exhaust. Carb has been rejetted. Need to know which jets i need. Dealer says could be one of three. that I need to take mine out to see. Dont think thats true. think his three options are for diffrent alltitude/areas, its not going have a diffrent bore size for jet from one bike to next. also, is it likely that i need a new jet needle? I am In Ga.
Bike is 2002 model.
Thanks

[2muchquad]

yeah,you definately need to find out whats in there now before you replace it:(