Here is the ebony upholstery panel from my cracked door panel:
With the ebony arm rest and map pocket in place, now came time to plastic weld the map pocket in to place. The arm rest has to wait until the cardboard upholstery panel is in place as its mounting tabs are melted over the panel.
I used a plastic welder with a flat tip (basically just an overpriced soldering iron), to melt the tabs back into the panel and bond them together.