Re: Royal Sierra or Spirit of '76?
Take the VIN to a dealer. (Edit: I say this every time this question is asked. I don't know if anyone ever does it.) They might be able to look it up for you. Mine did for me, but it's a Canadian-built truck in Canada.
My guess is someone added the door panels to make their own special edition.
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2007 GMC 2500 CCSB LBZ
1991 GMC 1500 RCSB 350
1981 GMC Street Coupe RCSB 454
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