cant really tell with out seeing the sides both the low stock wing and the navan look the same to me at those angles. But yah the navan wing has a red LED down the center. Silvia tend to have the emblem on left also.
Japan s14 have 3rd brake light, this HKS kansai car has it, trust me its a zenki its actually the car the caused me to buy a s14 in 1995
http://i.xanga.com/wylin/hksr.jpg
http://i.xanga.com/wylin/sa3r_olds14%20copy.jpg