[LockDoc]

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To the best of my knowledge all of the trucks with the rod linkage had the hole in the area that the picture shows, because the cable fastens to a bracket on the accelerator pedal arm outside the firewall. I have included a picture of the '71-'72 setup that connects to the pedal arm inside the firewall. All the rest of them install like the picture in the link I posted, unless they are aftermarket. It really doesn't matter where the knob is located, the hole in the firewall would have to be in the same place. The hole is pretty small, and can be hard to see, are you sure you are not overlooking it?

LockDoc