You've got 18's on there from memory dont you?
Just a word of advice, you might be wasting your money mate. I bought new inner guards for mine, and eventually my 17's rubbed and rubbed and chewed through them.
I know theres a thread because I remember posting in it.
See: http://www.4gtuner.com/index.php?/topic/10009-genuine-evo-barse123/page__p__124426__hl__%2Bfront+%2Bbar+%2Bdifferences__fromsearch__1#entry124426
Forget the fibreglass crap, just go genuine.
As mentioned, the 8/9 bonnet nose will stick out a bit if you dont get a 9 front bar.
You will need a new undertray, and just make sure you get the reo with the front bar.