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In 2018 GMC Acadia, make sure to use a 24-inch blade for the driver's side and a 22-inch blade for the passenger's side. Fortunately, there is no need to worry about a rear blade. Replacing the blades typically costs around $20 to $30 and each set comes with two blades. To replace a blade, pinch the plastic nub at the base of the blade to remove it, then do the same in reverse to install a new one. After installing the new blades, run them for a minute to ensure they are working smoothly and not causing any scraping.
There are 24 drivers and 22 passengers in the front, and there is indeed a rear wiper that measures 11 inches in length.
The back wiper is actually 10 inches, not 11. I had to return it to Auto Zone because they mistakenly gave me the incorrect size.
A 2018 GMC Acadia will require a 24-inch windshield wiper blade for the driver's side and a 22-inch blade for the passenger's side.