Add headrests to 67 Dart bucket Seats

I know that headrests were optional on 67s with bucket seats.
You might find some or you can use 68 or 69 ones.

1967

http://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1967/67_Dart0010.jpg

1968

http://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1968/68_Dart0016.jpg

1969
http://www.hamtramck-historical.com/images/dealerships/DealershipDataBook/1969/69_Dart0018.jpg

1970