Background
Refer to the removal of the rear interior trim and top B-pillar cover discussions. Part of the rear side panel will be salvaged to fill in the lower interior space between the front door trailing edge and the inside of the front truck bed wall (that is, the back of the cabin).
Carefully separate the black plastic panel body from the leather covered fiberboard and the curved plastic top casing. The foam filler and rear speakers can be discarded.