That's the PCV to intake plenum hose.... Should be the same for all 2001-2004 4.6 2Vs.
SHOULD be a Motorcraft KCV135 (Ford #3R3Z6A664BA) which is a "Emission Valve to Intake Manifold Hose"... They also show a Motorcraft KCV136 (Ford#3M8Z6853AA) as simply a "Connecting Hose".
Probably one of those parts that you just pull off, carry in, and match to a universal PCV hose.