INFARMGUY, Looks like you have a bunch of extra holes in your dash. The one above and centered on the radio may have been used to mount a “stop light viewer”, especially if your truck had/has an exterior sun visor.
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~ Dan
1951 Chevy 3 window 3100
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"My Grandpa Carl's Truck and How it Became Mine"
1966 Chevelle (Wife's Hot Rod) | 2013 Chevy Silverado (Current daily driver)
US Army MSG Retired (1977-1998) | Com Fac Maint Lead Tech Retired (1998-2021)