these will fit yours, (05+sti) not sure what height it would sit at though
Sti suspension | Brakes & Suspension | Gumtree Australia Cockburn Area - Coogee | 1052455976

Sorry my bad been a while since I did any suspension mods
It was the fronts that didn't fit as we did the same thing with my mates car, 06 STI stock suspension into an 03 WRX to pass pits.

don't go half half get the complete piece
02-07 wrx = 02-04 STI same same more or less
05-07 STI and above are different

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Chinese Mexican
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for $200 i reckon it might be worth the risk, guy might always have some photos of how low it sat in his.

cheers for the find!

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"All in relation to nothing. Nothing in relation to infinity. A central point to both, And infinitely far from understanding either."