What size hose is the heater hose
If you meant diameter, then I think ours are 5/8 inch type. Many GM vehicles used both sizes on the same application, but ours are only the one size.
But just like the length and routing issues brought up by airbur, the diameter needs can change due to what you're installing as well.
Sounds like yours is leaning towards the stock-ish (didn't go back over the discussion), so the heater core tubes are always the same of course, as are the typical Bronco style water pump and intake manifold ends.
If any of that stuff has been changed however, you'll have to verify what you have.
But those two sizes, 3/4 and 5/8 are the most common if I remember. And again, I think ours are the 5/8" size. Been so long though you can't trust me to hold the flashlight! Best wait for others to verify.
Paul