Dave,
Thanks for the info, but I'm looking for part number compatibility; particularly as it applies to headrests. The 67 Barracuda had one-of headrests (as far as I can tell). It's likely I must find one of those headrests. However, of equal importance is to get the hardware (clips, face plates, springs, etc) that is internal to the seat (behind the metal back panel). If I could determine what other models/years have identical hardware then I can proceed. The '67 had, I believe, a unique rod diameter as well as distance between the rods, and the rod length. Only thing I have is a photo from the '67 factory brochure showing a curved base, form-fitted to the seat back top
Tony