2013 rear wiper blade

A few months ago I got a 2013 Chevy traverse, i went to Walmart and bought a rear blade and it didn’t fit so I looked in the owners manual and it says I need a 11 in a half inch blade. I bought one online and it didn’t fit 🤦🏼‍♀️ What am I doing wrong? Is there another size that will fit the rear wiper?