I'm really serious about getting an S14 240SX, so here's a link to a kit I really like due to it keeping the stock lights. It's the Shogun Style 709: http://www.spoilers.com/ge/niss24095.htm
its not a gap its actually a spoiler. part of the aero package (body kit) you don't have to put it on the car and underneath it there are the stock headlights. anotherwords, you don't have to do a headlight swap on either of those cars (and you don't have to use that spoiler thing either)