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More info on my problem seat. The glove box trim/option numbers indicate A52 Front bench seat, and YER Silverado Equipment. Does this help or just muddy things up?
I think it's was a salesman's easy upsell. It was very annoying so many people swapped out their seats just like I did the first chance I got. I wish I had kept it though because mine was mint. It was a nice orangy brown plaid vinyl non folding seat. I used to pull my arm out of its socket, dangle it back there and use my magnetic finger tips to grab anything I needed. If you wanted to put speakers or anything back there you had to unbolt the seat.