Thanks for the info. The chevelle seat is not too far from where I live. I plan on taking a look at it this weekend.All post 1961 Tempests are bench seat cars, after 61 you had to order a Lemans or GTO to get bucket seats.
I think you need to limit your search to 64-67 A-bodies, they did change the floor pans for the 68-72 cars so I am not sure they will bolt into the earlier cars without modification. I would not buy the 69 Chevelle seat without double checking that it will actually fit. Just FYI