I went through the same thing on my 67. If you feel around, you can just make out the holes through the headliner. They are right above where the door glass meets the quarter glass, just work your way up and feel around. They're there! Sorry I dont have pics, I can probably get you some measurements in a day or two as my car is in storage now, but I'm sure someone will chime in here with some more info or pics.
http://www.pro-touring.com/forum/sho...ghlight=morris
Thats an install on a 69, on the 67, the brackets mount more towards the front of the car, on the other side of the coat hanger.
Hope this helps