I just finished mine today:
Here is the best source:
http://classicbroncos.com/tech/explorer-5-0-serpentine-accessory-drive-belt-conversion
However, I ended up not liking the AN fittings to inverse flare, to many pieces to leak.
I went old school and went to a Parker store and had a hi pressure hose made using the explorer pump fitting and the 4x4x2 Hi pressure input fitting. $35.
I bought a NAPA 97 5.0 explorer power steering hose to get the explorer pump connection which is metric ($12). I read to many folks have issue with the AN oring adapter. I then went to Parker store and had them cut the metric fitting off, weld it to a new line and on the other end used the 5/8 flare into the hi pressure side of the 4x4x2. For all intensive purposes it looks like a stock PS line.
I then used napa again and bought the 78 Bronco power steering low pressure outlet with hose, that gets me the low pressure return. and some hose to go to the cooler I then went to the junk yard and pulled two PS coolers, one off an Expedition the other off an F150 with a triton motor, don't know year but both are identical, in fact I saw another ford Excursion with the exact same cooler.
Still working on size of pump inlet hose, im on my way to return a part to napa right now.
So that's what I did.