Background
Refer to the bottom B-pillar cover and headliner discussions.
The top B-pillar cover abuts the rear window fiberglass surround and, like the lower portion of the cover, the top must handle the corner transition from hard cover to padded soft fabric.
Re-purposing of scrap C-pillar cover
The scrap D-pillar fortunately has a profile curve that is nearly a perfect match for the outer (that is, facing the rear window) edge of the B-pillar cover. With a little surgery, a piece of the matching plastic can be extracted that can handle the interior light mount (instead of moving the light forward on the headliner).
