cargo light/ 3rd brake light install

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mxer147

83 K20, 350 vortec, 465, 208, 14/10, 4.10, 33s
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Colorado
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Jack
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1983
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k20
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350
What’s hiding behind the vertical panel between roof line and rear window. I’d be bummed if I created extra repairs if I drilled in the wrong spots. Any pics available of the factory installation holes? I’m installing a newer led light, not the factory original.
 

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TotalyHucked

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Zach
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1985
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Sierra 1500
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5.3
That seam is where the back cab panel and roof panel pinch weld together. So that flange goes straight inward and is about 3/4" wide. Then there's the inner roof structure a little over 1" from the back cab panel. I've thought about doing this myself but not sure I've got the balls
 

Grit dog

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Todd
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1986, 1977
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454, 350
What’s hiding behind the vertical panel between roof line and rear window. I’d be bummed if I created extra repairs if I drilled in the wrong spots. Any pics available of the factory installation holes? I’m installing a newer led light, not the factory original.
Do you have a dome light inside? You can see what’s back there. It’s not scary. Measure twice, cut and drill once.
 

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