I'm interested in adding head rests to my 1967 122. I've seen some in action, and was curious if, for example these (pictured below) whole seats were pulled from a later car, or maybe just had the headrests welded into the seat frame?
Also, if you have experience with your own seat / head rest mods, I'd love to hear.

Also, if you have experience with your own seat / head rest mods, I'd love to hear.