Add headrests to 67 Dart bucket Seats

Your right, I used 68 buckets out of a barracuda in my 69 Dart and they measure about 8 1/2". They're some weird things on a 67 I guess because it was a transition year between the old body style and the newer style. I'm restoring a 67 GTS 383 Dart with a friend of mine and we keep running into little issues like this.