Bench seat covers with plaid inserts??

[Loptics]

Folks,

I checked out a 1971 Chevy truck for sale that was medium red with a black trim (door inserts, dash pad, and base seat) interior. The glovebox panel said a "parchment" OEM trim was what the truck had, which I take to be an off-white or beige. It did appear that the door inserts were painted over.

At any rate, the seat was black vinyl with a red/yellow/white cloth PLAID insert. I've never seen this before, which the owner claimed was original (or correct for original)...

The seat, while in excellent condition, did seem pretty old.

Ever seen this before?

Scott