Black plastic rounded corner pieces in cargo area of a 65 Barracuda

I was looking for something in the basement today and found a couple of those curved corner pieces, at least that’s what they appear to be. IIRC they cane with a 65 Barracuda I eventually parted out. I’ll get some pics later. I might have another set in my storage that I would have removed when I parted the Barracuda out. I’ll check on that in a day or two.