Seat ID Help

67-69 Pontiac firebird ? I looked at a 73 duster that had demon front end about a year ago in Tennessee that had those same seats, guy told me they came out of a firebird.
Well I remember hearing stories of a firebird. Since you looked at a duster with these seat will these bolt into my 71 Swinger or will fabrication be needed? Not scared with fab work just wondering.

Edit: Just did some googling and the seats that popped up as stock 67-69 firebird don’t really look like these. The backs were smooth vs the knee cut outs and if they had a head rest it didn’t look like these.