I have a 2005 catalog and it shows the seat stays with bosses and they are straight. Colors were Opal Grey and Ocean Blue. I own a 2006 and it doesn't have the bosses and it features the slightly upward curving seat stays. So, all I can say for sure is that it's older than 2005 based on the rust color. Maybe somebody else knows which colors were which years to narrow it down for you.
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