wired...for which fog lights?

[Kaleid]

Continuing on my fog light education here, how would one know if their car is supposed to have simple below the bumper fogs or through the horn grill fogs? Was the wiring different? If I took the grills off,should I see some hole inside for the wiring that was set up at the factory? I have the switch inside the car- that's about the only clue currently as to this car's past potential fog option. Is the fact that my fog switch is the left-most knob indicate which type this car should have? Don't know the "right" setup...any theories out there would eb appreciated.

Thanks!

[rpidduck]

I believe the fog light option always referred to the below bumper mount. The horn grill site was used for driving lights, which required a modified horngrill. This true through 1968 anyway.