If you are referring to "plugs" as in the electrical harness connectors, those can be sourced through Ford. They sometimes come as what some refer to as a "pig tail" (connector with about 6-8" of wires attached). Sometimes you can get just the plug/connector end.
These can be found on eBay too.
The plug or connector may also be referred to as a "Molex pinout"; reason being is Molex is a major supplier of all Automotive industry connectors/wiring to both domestic and foreign automobile manufacturers.
(I have no affiliation with the above businesses or know of their business etiquette, just passing along the info).
Another way to find the plugs is sourcing a used electrical harness on eBay or through "LKQ" (used auto parts supply house). If a local salvage facility has the donor car, then again another way to source the parts.