This is the part that forms the rear wall of the boot area. The boot catch bolts onto it, as does the rear number plate panel and it extends out either side for the bumper to mount through, the rear wing brackets to bolt to and the "elephants ear" panels to weld to. There is a separate panel below this between the chassis legs that fills the gap between this and the boot floor panel, see below.

Zinc plated - must be keyed up well and etch primed or epoxy primed before being painted.