Do I have the correct bucket seats? 1971 Demon 340

So right now in my 71 Demon I have the wrong rear seat. It is a bucket seat car "C55". I might have a lead on a seat frame for a Duster that should be correct but would need new covers. So I want to order legendary covers asap as I know they take 8 months to ship out.

The problem I am having is that Legendary only has a Black/Charcoal seat cover and the bucket seats currently in the car appear to be all black. I gave them a call and according to the guy I talked to all 71 Demon/Duster seats were Black/Charcoal with the code "M6X9" which is present on my fender tag. Is this correct? I attached a picture of the bucket seat which appears to be black and the fender tag for reference. So maybe someone reupholstered the bucket seats in all black at some point? Or are these not the correct seats? Based on several cars I've seen online they appear to be correct and I've seen a few 1971 Demon 340 bucket seat cars that appear to have Black/Black seats front and rear.

To sum up I am trying to make this car as original as possible so I was hoping someone could tell me if the seats should actually be black/charcoal. The guy at Legendary said they could custom order a rear seat cover in all black with a 25% customer up charge so I need to decide if I want to do that our just recover the front and back together.

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