I just bought new wiper blades for my 04HCH by using the lookup-book at Target. They said 19" for passenger and 24" for driver side. The 19 matches the old one, but it looks like my driver side had a 21 on it before. The 24 seems to work fine, and it covers the glass to the limit on both ends without hanging over, but I still wonder what the official size is supposed to be.