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I don't think theres any difference between 2001-2003, actually i don't think there any difference from 1999-2003 besides new graphics. Though for 2004 it uses a 38mm carb.
my dads 99' has a different setup for the hoses coming out of the carb than my 01' does( mine has an extra hose that comes into a T piece where his is just one line)