OK. I was perusing the web and what it looks like is that 67-69 used 9" drums and 70 and up F body's went to 9 1/2" drums. Does that sound right? They seem to sell 9 1/2" backing plates. In fact, In-line tube sells the whole setup with backing plates and all the hardware and brake shoes assembled. That is what I need anyway. I assume 14" wheels will go over 9 1/2" drums?