You can go to Auto-one, Repco, all you need are the numbers off the belt.
Should be 5PK then the length of the belt.
Or your local Subaru dealership will have them for around $60
I work at a dealership and we always have them in stock.

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