Hot Rods Mystery headlights

Trying to figure out what these headlights are thanks

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Tilt ray, Guide points to General Motors. There seems to be no traces of chrome. I would start looking at trucks approx. 33-36.

 

Those '36 back trucks had a little larger, flatter lens. These lenses look like '37 - '39 GM pass cars, but the bucket is industrial or truck … many independent makers used Guide equipment. Maybe check out Minn. - Moline UDLX tractor, but I think they had chrome rings ...

 

The wierd thing is they have a socket for a signal light or something inside?

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Possibly for a ‘parking light’........I seem to recall seeing a low watt bulb being used in the headlamp bucket for that purpose prior to adoption of sealed beam units.