The kits for specific vehicles are designed to fit the stock headlight housings of that vehicle. They may or may not fit into a set of aftermarket headlight housings; fitment completely depends on the shape of the housing.
The name Zealot creates a sensitive, imaginative, idealistic nature, which works for you in some parts of your life but is a severe limitation in others. In your personal relationships, self-consciousness and a fear of your deeper thoughts and feelings being misunderstood or belittled inhibit spontaneous verbal expression.
It's likely that this term did not primarily target the fire meaning, but the meaning of a passionate zealot. See this headline about Firebrand pundit Ann Coulter. Hence the many translations that don't have anything to do with fire.