I went to the store to buy new blades and the little book indicates that the driver side is 21" and the passenger side is 19". Digging around a little I see that this seems to be common for newer cars, but the thing that bothers me is I can not find anything in the owner's manual about what size should be on there. I bought the car second-hand so I don't trust that the blades on there are necessarily correct. It talks about replacement but says nothing about size.
Where can I find official information about the wiper blade sizes?