dsc33411.jpg

The vertical structural member appearing in the left of dsc33410.jpg.

Note the S-3D engine's gimbal actuator (the small, rust-colored cylinder at top center).

The short, empty cylindrical item at bottom left would hold structural rods to give rigidity to the aft skirt.

Picture 2 of 2.

I have a detail of the electronics box near the center of this photo at dsc33428.jpg.