The Futaba 8U-series of transmitters went out of production around 1999 or 2000, when the 9C came out. We serviced it until around 1008 or 9. It's been well over 15 years since they were discontinued, and they are no longer supported by us or Futaba, Japan.
We provide support as long as it's possible.
Your first post did not state that you only need switches. Toggle switches have remained unchanged for most transmitters, and you can find them here:
http://www3.towerhobbies.com/cgi-bin...=futaba+switch