Will they fit it my mk1 fabia? I'm sure the rear bench will be bigger but what about the fronts??

Thanks

Won't be a direct fit. You will need to fabricate runners/ mounting plates.

Seats from the following will be a direct fit

Mk4 seat Ibiza

Vw polo 9n/ 9n2

Mk2 Fabia

Possibly Audi a1 and mk5 Ibiza

You'd need to do the same swap with the R32 seats as I have done with the GTI Recaros.

Swap the leather and foam to the Fabia metal work and put it all back in.