You are going to need to go to a junk yard to get those pins I don't think anyone sells them becase they do not wear out. You mit be able to find them at a ford posibly. Not having that pin in there is the cause of all the problems you are having.

 

Are you sure that is supposed to be there? Not all cars have that. I can't remember it the I6 mustangs have them or not.

 

does anyone has a picture of the front and rear brakes 9' drums for a 66 coupe. all my books show different pictures