I am changing my car and I have a roof rack for a 06' ford focus that I wont need anymore. I was just going to leave it go with the car for the new owner but if it will fit you can have it.
The roof rack for the focus bolts straight down into the roof, there are hole already in the car from new for this rack. If the fiesta is the same idea I think it could work?
Check it out and let me know, car will be gone in 1 month.