Read this article:

System Enablers: Current Versions & Change History

URL:

http://til.info.apple.com/techinfo.nsf/artnum/n11491

This article has the same table, and also details which OS versions are compatible with which machines:

System 7.1 through Mac OS 7.6: Compatibility With Macintosh Computers

URL:

http://til.info.apple.com/techinfo.nsf/artnum/n8970

Apple actually has the enablers available for download--somewhere.

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