Sail Panel Dome Light Wire Routing ('65 Barracuda)?

How does the passenger side dome light get routed over from the driver's side? Does it just tuck under the headliner somehow? I notice there is a "nub" that should snap into a hole somewhere (see photos #2 and #3 for nun location). Thank you.

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yep, the passenger side wire is attached with normally a clip to the bow under the headliner. I have a complete harness including lights if you’re interested.