No problem :-) I have just done the modification using the 10.2.1 as base and 9.8.1 as reference for the right syntax during editing, I have a MacMini (7447) so this ROM does not work for me but I hope you will have better luck ;-)

Here is the link for the download

http://www.mediafire.com/download/a6ajgzsk346dzwa/MacOSROM_1021mod.zip

Please report your results here! Have fun! ;-)