You might check out this site...I think it might be called ArizonaIntegras.com. If that's not it, I can find out the website for you. Anyway, if it works, they might be able to point you in the right direction.
The only shop I ever went to in Phoenix for parts was Versus Motorsports. I don't know if you've heard anything about them, but I was a happy customer the couple times I dealed with them.