There are other subtle differences. Gas caps 2002 and earlier are large; later than 2002 they are smaller. The earlier bikes had slightly different electrical systems so year is important there. There is a sticker / label on the front tube that has the vin number and actually lists a year. The year stated is the model number, the vin number has a coded two digits that correspond to the actual manufacture date which may differ by one year from the model number. You can interpret all the digits of the vin number if you search for the info on the web. Good luck. Tom