I was referring to Federal Motor Vehicle Safety Standards, Sec. 571.108 Standard No. 108; Lamps, reflective devices, and associated equipment:
Table IV - Location of Required Equipment
Quote:
Headlamps
Surface measured from center of item on vehicle at curb weight:
Not less than 22 inches (55.9 cm) nor more than 54 inches (137.2 cm).
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FMVSS
I think the center of the Silvia front end's headlamps are below 22 inches, therefore they were never DOT legal and even if you found housings stamped with the DOT, they would not be up to standard due to the height restrictions. Unless, of course, you put a lift kit on your s13.
There are also standards for cutoff in the above section.