those aren't 180 lights w/ vinyl overlays. follow the "lines" of the lights and you'll be able to see that. true, they are zenki or chuki 180 lights (89-96 180sx, 89-93 240 f/b), just not the kouki lights (96.5-98 180's) which i'm assuming you're referring to. OneLine was the company that made that kit, they stopped making it a while ago, Hasemi Sport made taillight cover kit for the kouki tails (giving it a similar "Skyline" look/effect), but they also stopped making it. i had tried to obtain those kits from back in late 97 when i first saw them and ran into countless dead-ends and then being informed by numerous contacts in Japan that they were discontinued. the info of the Hasemi kit came directly from Hasemi Sport themselves when i had a friend call them directly to find out info about it. although i've heard that a few of these light kits are floating around at some tuner shops in Japan and can still be found new, just gotta be lucky. the kits are rather pricey though, somewhere in the $500+ range.
the term OneLine did indeed come from the fact that originally someone in Japan took a set of R32 tails and modified/swapped them into a 180sx taillight housing, 180 front/Skyline looking rear = OneLine.
here's a link to an ad from a couple yrs back that i'm sure a lot of ppl have seen before
http://members.tripod.com/GAI_P/AERO.htm
another one to a club in Japan who all have the OneLine kits
http://www.aa.aeonnet.ne.jp/~col/oneline/oneline.htm for those who can read Japanese, loosely translated (and i stress "loosely") the site says something about the lights for the R32 and 180's being interchangable. i dunno how true that is, but there's mention of that on the page