Yup- ours is a Sept '72 car with the early seats that have removeable backs. And you're right- the early seats are narrower. IMHO they are the only 'stock' seats that should be considered for upgrades or reupholstery. The later one-piece seats have a fully welded frame thats often cracked and are not adjustable, and the Euro seats are much bigger in all directions but (to me) are no more comfortable. FWIW, I once adapted a set of F-car Boxer leather seats to a '73, and that was an absolute nightmare, with multiple tweaks in many places just to get them to fit and adjust. They looked nice, were low & comfortable but the amount of work needed was prohibitive. NOT recommended!