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07-03-2014, 11:20 PM
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#10 |
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Senior Enthusiast
Join Date: Feb 2007
Location: Spokane Valley, WA
Posts: 8,356
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Re: 66 GMC- what is this on the roof
I would also assume the hole was created to mount some type of roof light. If exposed to rain, it also seems water might be prevented from entering the cab depending on what the plug looks like, but it appears a great deal of water would be allowed to leak in above the inner roof panel and rust out the windshield header and A posts.
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