Hope this video helps out another backyard mechanic.

Known part numbers if you're missing something in the video:
Square rubber panels (skid plate cover): BL3Z6C070A
https://www.fordparts757.com/oem-part...

Felt composite underbody panel: unreadable to me, video of part number below
   • 2015 Ford Expedition Composite Felt P...  

I'm not sure how many years Ford will run this platform. If you have a ford expedition older than the title please let me know this video applies and I will update as the wheel of time turns :)