67 Dart headrests + bits
They do exist. They were a one-year only design and were fitted only as an option. Essentially, they are like rocking horse poo!
Jan '69 they became mandatory on all vehicles as a safety feature. I am trying to avoid the '69 seat issue but it may be an option. As may a set of recaro etc in their place. Not a great look for a resto-mod though.