Not totally sure on my trucks original options, deluxe to some lvl, but I'm the 2nd owner (PO bought new in '54) and mine came with the seatback cover. It sure looks like original, the cardboardy material is similar to other interior items like the door panels, and the texture or grain matches too.
I do have corner windows so if it was to cover the view with that option that would make sense.
Pics in the link in my signature, middle of page 6.
Still have it though no longer installed if anyone would like more pics/info
1954 3600
Chooglin
