From the factory, blades sizes are 16.7 (driver) 15.7 passenger. I originally purchased Trico snow blades 17 (driver) 16 (passenger) and they fit great. However, Trico blades are, terrible, and right away they started to streak.
I eventually replaced both with 16 inch Anco snow blades and that solves the problem with them icing up inside, causing streaking and generally poor wiping conditions.
As for an auto parts store not knowing about different size blades...well, I would guess the majority of vehicles made in the past few years have a longer driver side blade.
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Black Sheep Hummer Squadron
(ME TOO)
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