Motorcraft Engine Coolant

Walmart has the best priced anti-freeze, it's about $12 for a concentrated full gallon, Prestone. That will work in almost everything, and the old Fords I recall took about two gallons, half of a four gallon capacity.

Chris, I don't know the Ford part number for the green coolant, and I am not sure if Ford even carries it anymore.  However, as others have said, just got to a parts store and get the traditional green coolant.  Like Inkara says, not the "any make and model" stuff, this is the non-long life green stuff.  I typically by the non-premixed stuff and jugs of de-ionized water, and pour in at a 50:50 ratio.   Once you pour half a jug of each, mix the two together in a jug and then you have 50:50 for top ups.

Chris, from that chart, you want the Green Coolant, used on the 2001 and older cars.  I worked at GM when Dexcool came out and I remember how much of a pain it was to have this "new and better" coolant. You had to make sure you didn't mix the two and use the correct stuff depending on the model and year.  Prior to that, every car, at least American cars, used the same green coolant. As you change the green stuff regularly, it works great IMO.

I hate the over-priced pre-diluted antifreeze, but I get it. getting another empty jug and cutting a gallon of concentrate is too much for the non-car folk in the modern era and they make it easy.

*Sigh* I remember when I would buy gallons of undiluted green antifreeze for $4/gallon at Advanced Auto Parts years ago.