Man, I really need a manual dedicated to the 64 1/2. The Haynes manual I have shows the exact same switch you posted, along with a diagram on where it is located. So I removed the front seat, wedged myself under the dash and...no switch. I rooted around thinkin it might be hidden, but how could it be if it was supposed to be connected to the brake pedal? The answer is that it is under the hood, screwed onto a coupling to the master cylinder. The only reason I can think that it would be different is because of the generator, since it was the only model to have one. My manual only gives you diagrams of the most common design for Mustangs b/w 64.5 - 73, which in cases like this is completely different than what I'm looking at. Any ideas on a definitive 64.5 manual?