New Denali Seats - Help ID the old ones

[C.I.Blazer]

Got a great deal on a set of 2011 Denali seats. Was able to get the middle row captain fold and tumble as well as the third row. While I would ultimately love a set of original seats, they are just not in my budget right now.

Can someone please help me ID the seats that came with my Blazer? Obviously the fronts are not original, I think they may be out of a later model Blazer. Do the seat mounting brackets look original? How about this rear seat? If any of this is original maybe I should hold onto it. If not, then I will just get rid of them.

Thanks for the help.