It's 7C-8122296/97
Yeah, there's definitely soft material inside that channel in the factory parts.
https://autopartsobsolete.com/1948-4...c-8122296.html
Undoubtedly other vendors have just the seals too, and I found these online
pretty quickly......
https://www.cmwtrucks.com/product/48...er-metal-pair/
and.....
https://www.npdlink.com/product/run-division-bar/131408