The tracks are definately 72-74 E-body as the outside flat plate on the bottom gives it away as to being E-body. Also another indication of being 72-74 is that there is not a cross over wire to unlock the inside track as there would be on the 70-71 seats. The covers were probably installed by an aftermarket company. Either way they are a good score for free. The tracks wont work in an A-body as you need the correct tracks to be higher on the outside track to fit the floor. The backs also indicate 72-74 as they are of the one piece design where the 70-71 have metal covers that hide the hinge area. The closest cover I looked at in the Legendary catalog is for the 70-71 Cuda Gran Coupe leather seat cover with the seam a couple inches from the front of the bottom cushion, but those original ones didnt have the ribs all the way up the headrest so hense the aftermarket reply. Hope this helps. Greg