i think they barely prototyped them and are hitting the market about now. check out www.sr20deforums.com and look around in the 200sx se-r forum. there should be a thread on it. i think theyre running for close to $1100. theyre the setup i want to run, cuz i think tien is the best-selling coilover brand in japan, and i think they come w/ the upper mounts, which gives you a lil bit more wheel travel
TEIN as well as other companies make the spring or coilover using the stock strut. Sometimes companies will use other struts like Ground Control makes coilovers for the B14 with Konis, KYB, and some others too.