They are as original as the FORD one, FORD never made any windows for any car ever in it's whole history!!
Ford used various outside suppliers as any other maker does, the SEKURIT glass was sourced from Saint-Gobain Sekurit, they employ near on 1/4 million people in 56 countries, and do most std fit auto glass, you could certainly get sekurit if you want, but would cost more, otherwise there's loads to choose from make wise.
tabetha