I bought my 16 used and it had oem blades on it so either they where the first ones still or they used oem parts at some point. I had my 16 over a year when I replaced the blades so they lasted a good while. Then again I do live in Socal so it rarely rains but it does get hot enough in the summer to really damage blades.

I got mine off amazon for like 16ish each. Looks like they are both 17.40 on amazon atm

https://smile.amazon.com/Motorcraft-WW-2601-Wiper-Blade-Assembly/dp/B00J5DXEBK

https://smile.amazon.com/Motorcraft-WW2700-Wiper-Blade-Assembly/dp/B00HFL901W/