Wondering if anyone has a link to an official spec. for the wiper blade sizes on the Micra?

Picked up our car new on Monday, and it's been raining / freezing here in NS since -- the OEM blades don't seem to handle ice in them terribly well, so I'm planning on replacing them with one piece winter blades. I've picked up a 26" and a 14" based on a suggestion from a 3rd party, but I'm curious if the intended measures are out there somewhere and I've missed them?