Bed rail caps?

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Hey guys! Does anyone know of a vendor that sells black bed rail caps for 67-72 chevy pickups? I'm referring to a protective "cap" that covers the top of the bedside from the front of the bed to the rear of the bed. I've seen that LMC carries some that are smooth/polished as well as some that are polished diamond plate... neither of those are what I want. What I'm looking for will either be black ABS plastic or black powder coated metal (diamond plate?).

I've google searched this til I'm blue in the face... They're out there everywhere for 88-present... which doesn't help. So... anyway.

Thanks!