For the Ford Focus we used only model years for the North-American models, and mk for the rest of the world. One of the reasons was that the mk2 version was a different car in N-A, but also that indeed N-A does not use much the generation numbers but only model years.

Question for everyone then:
Do we do the same for the Fiesta, as N-A only got the first and sixth?
Or do we label them with mk like the ones of the rest of the world?
(and for any decision, the same should apply to mk1: currently only some have the mk tag)