Q: What os 9.0.4 install disc do i need to install it on a ibook clamshell

You need a retail Mac OS 9, 9.0.4, 9.1, or 9.2.1 CD. You can't use a different Mac's original disk.

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Check out the available software discs here:

http://www.welovemacs.com/os9opso.html#top

You can use Classic environment by placing a 9.2.2 system folder on your iBook. I have links to information as well as a download that can help you do this. I have Classic on my Tangerine iBook as well as a 2004 G4 iBook for occasional need to run pre OS X applications.

http://en.wikipedia.org/wiki/Classic_Environment

https://groups.google.com/forum/?fromgroups#!topic/macos9/nR2QQCKaCFA

NetBoot for Mac OS 9: Information and Download