Originally Posted by firstname.lastname@example.org
No response yet but it appears to be a Corvette light from about 1991-1996. It also is designed to sit at the top of the rear window outside, so I don't think the elements are an issue.
I looked around for a light of that vintage and could only find this
, and similar. They don't give any specs either but it looks like it might fit about right, however it doesn't look in the photo like it comes in a housing that would be mountable onto Clay's bar or an OEM bar. It looks like it is designed to be mounted into the existing C4 Corvette housing. Maybe you found a different animal.