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I believe it's 21" on the drivers's side and 19" on the passenger side. Most places that sell wiper blades (at least around here) have a reference catalogue you can consult for just about every make and model of car and what size wipers it requires.
^^ Yup, 21" on Driver, and 19" on passanger.. Just swapped out mine the past weekend.. Although different brands do vary.. Wal-mart has a nice digi ref. where I got mine..