WTB '75 to '80 high back buckets

[Gregsmx]

I have a '75 Blazer undergoing restoration. I am looking for a set of high back bucket seats. I'm not sure what year they started using them. I've seen 78 Blazers with them installed, but not sure how much earlier than that. The seats also need to tilt forward (at least the passenger seat) to let folks in the back seat.

I don't have to stay with '75 vintage, but I do want to stay period correct ('75 to '80). What I mean is I do not want to put aftermarket new buckets in.