FORD like all other manufacturers do not make their own parts, they are bought in from third party suppliers, who continue to make these even when not supplying the original manufacturers.
The good ones are oe suppliers with same warranty, and same tooling, as it would not be cost effective to tool up for all the little parts, the tooling is sold off to other people.
In short FORD did not make the pump to start with, and decent pattern will be just as good, most of the time if you stick to brand names, and OE stuff fails as well.
tabetha