Definitely - the Funkey kits were knockoffs of classics. This is not a Japanese design but rather a copy of Hanno Prettner's worlds winning Magic (1981 Mexico). Changing the name was surely a way to bypass rights given by Prettner to specific manufacturers. I suspect Funkey was one of the early forays of Chinese kit production. If the kits were indeed Japanese, then they were competing directly with the famed Japanese company MK run by Masahiro Kato who manufactured the wood kit.

as SC pointed out, you're looking for a Magic 60 "S" shaped header. Hatori made such a header as you've already discovered. The Japanese site you found it on is probably legitimate. Singapore Hobbies also appears to still have them in stock so you could order directly from them:

http://www.singahobby.com/?q=node/18155

An alternative would be to use a NR header (three different fuse top heights) which is spring mounted and therefore makes engine maintenance somewhat easier but an adapter plate and exhaust nozzle would have to be manufactured for the OS much like some were recently made available by Joe on the sister RCG forum to adapt the YS RE "Classic" engine to the same headers.

David