If you aren't picky about them matching perfectly, these are currently available
Black cloth w/ gray stitching
Model.. FOCUS MK3 2011-2014. FORD FOCUS MK3 2013 ZETEC. SET OF HEADRESTS CLOTH BLACK 2 FRONT + 3 REAR. Exterior Paint / Colour Code -. right hand drive vehicles.
www.ebay.co.uk
Black cloth w/ red stitching
Model.. FOCUS MK3 2015-2018. FORD FOCUS MK3 2017 ST-LINE. COMPLETE SET OF HEADRESTS. right hand drive vehicles. All parts were fully working on the donor car.
www.ebay.co.uk
I have the black cloth w/ gray stitching in the rear of my car and never notice the material or stitching difference.
Edit:
To be fair, I paid less than 60 USD for mine 2018, so the price difference to cares given about different material was much better