Imported materials are not correct because you can't alter their properties through scripting. You can use wdump to find out what kind of properties you need. The supply truck headlights material has the following properties (only listed what is not default):
Specular: 255 255 255
Emissive: 255 255 255
Blend Mode: Alpha Blend
Texture: Lightbeam.tga
For some reason one of the headlights is two sided while the other one is not.
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