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Detail of the aft end of the thrust structure.

At far right is the stages's J-2 engine gimbal fitting (center, where the engine's gimbal block would attach to the thrust structure).

Immediately forward of that is the fitting for stage's LOX feed line, and aft of that is the opening in the thrust structure through which the LOX feed line would emerge. Visible through this opening is daylight from the opening for the stage's LH₂ feed line on the opposite side of the thrust structure.

The panel at lower center is the stage's "customer connect fluid system," the pneumatic interface to the engine.