About C0ckpit Tatebayashi: C0ckpit stores are just your regular "Bob Jane T-Mart" type wheel, tire and tune up place, but Tatebayashi (and others) have complete "turbo tune-up menus", where you can drive your S14 in, and 2 days later, have a 450hp monster on your hands, with a complete set of coil-overs and 18" wheels and tires too. So they do almost the same job as a regular Tuning workshop... I say almost, because the emphasis (and where they make most of their money) is in the wheel and tire business.I'd go to C0ckpit if I didn't have any contacts with a regular tuning workshop (ie: C-West ) as they do the complete job in-house, and you can just choose a "tune-up package", you don't have to know what every part does.
About the "EDGE" bodykit: Sorry, my bad, I said before that C0ckpit Tatebayashi produced the "EDGE" bodykit... well they don't. The bodykit is produced by Emotion R, and is quite expensive compared to similar looking front bumpers by BoMex
Heres the EDGE front bumper for 79,000 yen (A$992):
...and the BoMex BM Type II front bumper for 30,500 yen (A$383):
I know which one I'd buy!
So C0ckpit Tatebayashi don't manufacture kits as such, but use other brands. I wouldn't say the EDGE kit is common (hence the price!) but they are made to the highest standards as is usual with the low volume Japanese brands. I guess try and go for a cheap EDGE knock-off, or the BoMex...