vacuum line. The sphere shape is a vacuum reservoir

 

Ford switched to hard plastic vacuum lines years ago, they look like wires

Yes the round plastic ball is the vacuum reservoir

Picture here: https://contentinfo.autozonepro.com/...47076/image/3/

It will have two vacuum hoses, one runs to intake manifold and may have "T's" on it, shared vacuum
The other hose will run to the firewall passenger side, it supplies vacuum for Vent controls, i.e. panel, floor, defrost, defrost is the default, no vacuum = defrost vent only

You can use soft vacuum hose to splice or replace the hard plastic line
Ford uses the hard plastic because its cheaper when buying bulk

There might be a part number but I doubt it would specific to one hose, more like a kit with several vacuum hoses

Wrecking yard will be filled with these, any Ford or GM, and pretty much any other vehicle with a gasoline engine will have vacuum lines, hard and soft