From Matt Jones @ Subaru owners WA FB page, they should fit any 02-07 Wrx and 04-07 Sti:

"IHI VF48. Bought new from the US, had the rear housing removed from new, had a mild porting job and was then ceramic coated. Made ~310hp at the hubs through a top mount ~3" exhaust and the headers below on an EJ20
Done approx less than 3000km but I can't quite confirm. It only stayed on for 8 months on my weekend driver, and as such is basically in perfect condition. Comes with the correct oil banjo and if I can find it, a spare. $800 ono

Kando imitation Tomei headers, same use as the turbo and have also had the CIC "double black" ceramic coating applied. $400 ono.

Or come get them both for $1k Located near Freo"

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MY08 STI 422whp at 1.5bar on E85, built by Diversion Garage, assembled and tuned by EvoR

Update from new owner: 375whp at 1.4bar on 98, at Tokyo Motorsport