Im pretty sure that all Impreza sedans have a plug stashed away in the parcel shelf somewhere.. just a matter of getting the right wires to connect.
If you bought a genuine Subaru rear light it would be as easy as plugging it in and fixing the light.
Edit: just noticed your car is a '09.. so the above may not apply for new shape impreza but sure someone will know and chime in!
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MY00 GT Forester with STi goodies
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