Hmmm. The car is in storage for winter in a barn 20 miles from here, and I could get the seat backs off, but wouldn't be able to do that until at least tomorrow. It was an April build, but now it's a Frankenstein and I don't know that the seats were original. I've had the hard backs off looking for broadcast, but at that time was not in the habit of photographing EVERYTHING.
I was hoping to take advantage of Dante's current sale, which ends tomorrow, but I suppose I may have to wait.
I thought I read a thread where someone said the 72 MY switched to seats with no hardbacks. If so that would mean 3 different seats that year? Maybe I was hallucinating, I'll have to look for that again.