Hi,
I can show you a list of 6+ websites (a ring, because they are all connected) distributors in Europe and World with parts made in China (and others) as an example. The graphics they show are "can't read" frequency response graphics that were originaly furnished by Motorola (or just copied). You are losing time. I give you an example to buy 15.000 of that such items from.Buy Obsolete Products here
(http://www.freescale.com/webapp/sps/site/overview.jsp?nodeId=010984007869597059286926661)
another (one) example of this service in Europe
(http://www.vdmais.kiev.ua/about_E.asp)
I prefer to stay with an old style cone tweeter from West Germany, that you can find the curves for (some don't).
RTO cone tweeter here (http://www.elfa.se/elfa-bin/setpage.pl?http://www.elfa.se/elfa-bin/dyndok.pl?lang=en&vat=0&dok=9752.htm)
Best Regards