oh no, those are 1970 Firebird seats ~ but they were recovered an the inner section was replaced with a cloth;
other than that, they're done correctly (as in pattern)...
I've seen some terrible recovers - and I wouldn't put those in the terrible group...
also, if your rear seatback & seat bottoms are a wire seat with burlap materila, you're set ~ because after 1973 the seat construction changed and the seat width actually changed;
if you have the right seat backs, then you're going to be good with a set of repop covers should you ever decide to go that route.... otherwise you're going to need to get a set of corresponding 1970 front covers and later back covers...
I found out all this the hard way;
I threw out my original rear seat back (back in 1995);
then upon purchasing seat covers ended up stealing the seat back out of my '73 for the '70 (otherwise the repop seatcover I had bought would have been useless - later seats are thinner);
I just recently acquired a correct replacement seatback for the 73.