go here:

[link]http://www.hobbypeople.net/mfr/ofna01.asp[/link]

see if you can find it there, if not.... go here:

[link]http://www.nitrohouse.com[/link]

Go to the Hyper 7 page and go to parts.

Here is some other places... just search for ofna:

[link]http://www.towerhobbies.com[/link]
[link]http://www.acehardwarehobbies.com[/link]
[link]http://www.horizonhobby.com[/link]

Hope that helps ya!