That's a good question , wish I would have asked before doing mine
Yea , one connects behind the passenger side head (That's the supply). It fastens to the tube that connects to the Water pump stem.
Other to the Intake Manifold (Return).
Replace w/Ford replacements hoses only. Actually those hoses you have on there now will outlast the vehicle, all Ford heater hoses will. The problem is in the connection. The bottom connection on the water pump Tube and Manifold. Replace w/OEM's at the dealership or you won't get quality hoses. You get replacement hoses that Clamp on top instead of Fords OEM connector. Trust me , that will blow off in time and you don't want that mess. So go to Ford for the hoses.
Plus your return hose has a brass insert in the return line. It a reducer that prevents pressure bursts. I disrupts enough flow behind it , to keep the heater core from being exposed to air pockets an susceptible to bursts in pressure.
Also you could be fooled into any of those two lines leaking. It could very well be the Water pump tube O-Rings. A bad design that doesn't last. If you look in section one in the Haynes and Chilton's manuals , they both show a repaired/updated tube -water pump stem assembly, updated by Ford Motor, but only on there Reman blocks.
Take a Flash lite, look down behind the Alternator on top of the block behind the water pump, you may see water trapped in the V. - A substantial amount if the O-rings are indeed leaking.
If so, that water leaches out behind the passenger side head above the starter. Yea , same spot as a leaky hose will.
I have pictures of all that, let me know if want them and I'll post.