I can describe the routing on my '52, may or may not be identical. There was a small hole in the "tack strip" toward the driver side. This was in the area where the pad connects the rear bow to the tack rail. The wire was run up through the inside of the pad. On the '52, the rear bow is metal and has a hole in it, allowing the wire to come through the trunk, through the hole in the tack rail, enclosed in the pad, and enter the hollow rear bow, traveling inside the bow to the light. With a wood bow, I would guess there would be a grove to direct the wiring across the bow. Of course I was only having to run a hot wire, grounding to the metal bow, where you would be running both hot and ground. Don't know if that helps.