Sounds more than plausible to me. Even if some of those parts would have been included in sub-assemblies, you can’t rule out that they were sold off as salvage from The plants that made them for Chrysler, Ford, etc

I was lucky enough to go to one of those salvage places in Detroit back in the early 80s. I remember fishing through 50-gallon drums full of new e-body racing mirrors, 4-bbl carbs (including Hemi), 68-69 b-body tachs. I was a poor college kid and I spent every dollar of the $100 I had on me. Wish I had a time machine...

I imagine a lot of those rubber parts will have the Chrysler part number/pentastar.