I recently took one off a 65 and the harness is held to the radiator support by 3 plastic tie straps. One at each end of the radiator and the center, the head pops thru the tiny holes in the support (1/4" holes a guess). My foggy memory says the headlight harness to the lights snaked around the support and fender while the parking light and horn leads went thru the large holes in the support and the clips attached to the hole.
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