I just went to my local AutoZone and they looked up a Freightliner M2-106 and went to the display and grabbed them. I believe they were standard 22" blades. Took them home and had them on in minutes. No muss, no fuss.
By the way the easiest way I have found to access the windshield for cleaning, RainX application, or in this case wiper blade replacement, is to raise the hood and then stand up on the tire.
2014 Seneca 37TS
Toads: 2014 Ford Explorer Sport or 2013 Ford Focus ST