I'm restoring a 67 cougar and have a set of 69 cougar seats front and rear and have a set of front 68 mustang seats. I'm going to recover the 68 mustang seats and use those. But can I use mustang seat covers for the 69 cougar seats? Will 68 mustang rear seat upholstery work on 69 cougar seat? I don't want headrests in my 67 which is why I'm not using the 69 fronts. any help would be great. Thanks!