Subaru Parts W.A. is the distributer in Western Australia. Don't think they'll be much cheaper then a dealer, unless your in the trade.
Be careful putting a grill in the intercooler scoop, any obstruction that restricts airflow to the intercooler could spell trouble, if anything you would only want to use flyscreen style mesh.

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F.B. Racing
01 WRX (STI badged)
2010 XR5 Focus
06 Impreza Hatch 2.0i