Replicast makes a Jha seat for the RS125. Check www.replicastuk.com. Of course its called the REV seat now. If you go to the replicastusa website its still call a Jha seat. The have the JHA fairing as well.
Boo hoo... never would return an email and ridiculous prices.... hope the door caught them in the ass on the way out.
There head development engineer for 18 or 19 years left them in 11/05 to start his own company. His name was Fujisawa. He has a company called Fujisawa Racing Services (www.f-rs.com). He is concentrating his efforts on RS125 stuff with most of his activities in the Spanish Grand prix series. He has a 07 powervalve kit for the RS125 out now. Only $23k dollars. Seems they learned their pricing from Jha.
They do have someone on the staff that reads and writes english. He mentioned to me that they can make replacement parts for some of the Jha kits. Who knows, maybe he has the pattern for the NSR pipes. Might be worth dropping him an email if you had to have some.
Chuck