Have done some upholstery work in the past. That bucket seat backrest looks like something someone made up trying to make the backrest look somewhat mopar.
As you can see they duplicated the seat bottom pattern then flipped that up and sewed it onto whatever backrest bucket seat cover that is.
Take 2 covers and make one. That area over the shoulders on the A bodies can be hard to sew up to look proper for the '72s. So they made up something with what they had available .
Looks like 73 buckets that they tried to incorporate some type of 72 headrest into.
Have Fun
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