The LOX feed line emerging from the stage's thrust structure, a gap, and the
J-2 engine's LOX
inlet (visible in this overall engine
Note that the LOX feed line fails to reach a support fitting on the thrust
structure. I don't have any photos of this side of the stage from prior
to the stage's restoration, but do see that the LOX feed line was in a similar
months after restoration on the stage began.
For a time the museum's Skylab
mockup had a LOX feed line
and J-2 LOX inlet duct.