I found this post on Boise Craigslist. https://boise.craigslist.org/pts/d/meridian-1957-ford-ranchero-fairlane/7128688197.html
From what I can see in the photos, there are a lot of "extra" holes in many of the bed trim pieces.
And the two upper corner pieces, that are usually chromed steel vs the ss the remaining pieces are made of, appear to be missing.......probably because they rotted away.