As is, they will not fit and the airbags will not plug in. However, if you have the appropriate year Fiesta, I believe 2016 and earlier, you can swap the Focus seat to the Fiesta base and move the Fiesta Airbag over as well. Its not super involved or difficult, but it does take a little bit of time. What I would recommend, if you want to buy these, is to quickly unbolt your passenger seat and tip it up and back, then look at the underside of the base. Take a picture or have the ones Ill attach here and see if the bases match up.
My experience wait this process was as follows and what I think happened at Ford with the seat bases.
First, this is the thread and post that shows you how to swap over seats from a Focus to a Fiesta:
https://www.fiestastforum.com/threa...s-in-Fiesta-ST?p=211027&viewfull=1#post211027
From what I can figure out from his profile, Zer0 has a 2016 Fiesta ST and this swap worked no problem for him. His 2016 has the same base as the Recaro, but the Fiesta rails and bolt points. My ST is a 2017 and this swap did not work for me because the seat bases are completely different, not just the rails and bolt points. My theory is that Ford didnt get enough orders for the Recaros in the and to save some money, just started upholdstering the base Fiesta seat with ST covers in 2017. I think they were just building Recaros at the factory when they got an order for them and to keep that process speedy, used a Recaro base without bolstering and their own "stock" seat back that would bolt to the Recaro base. Unfortunately, although I could get the Recaro bolstering to swap over to my base, the Recaro seat back WOULD NOT attach to my base, so the whole swap became a fail. This should not be the case on 2016 and older cars.
Like I said above, I recommend that you unbolt your passenger seat, and tip it back to check your base. The good Recaro base that you need and the bad base model Fiesta base that doenst work are very different looking, even from the underside, please see attached pics in the link:
https://imgur.com/a/jwTVQ1L
The pics are marked with what you should be looking for on your seats, as well as what base will and will not work.
Any other questions, or if you arent sure if your base is compatible, take a picture of it, and send it to me, Ill let you know what I think.