Source for Original Seat Covers

[Too Slow '90]

Since I can't decide what to do for seats in my '60 Apache I want to install the original bench (and hopefully the original style covers) while I'm figuring it out. I can't find any information identifying what was original in the truck. A while back I pulled what I thought were original black vinyl covers off but they were glued to what I assume is the original vinyl pictured below. I have an old brochure that shows the pattern (I think) and references a "Comfort King" cab but no description of the seat covers.

Does anyone know what these are called and if they are available? The truck is originally white with the silver/green or whatever the interior color is called.

Thanks in advance.