Jeff,
In your initial post you said you needed to know "how to get the rear backup lights back in through the holes of the valence", which I read to mean the back up light housing, not the wiring.
The housing is apparently connected to the valance with two bolts or studs and some form of hex nut on the inside of the valance.
From the other answers it appears I misread your problem, as it sounds like the wiring is what you need to know about.
Sorry for the confusion - I thought your were talking about the back up light parts on the exterior of the valance.
Neal
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