The SPC website makes no distinction between sedan and hatch for this kit, and even includes the Mazdaspeed3. It seems unlikely that there is a suspension difference that would matter to the kit.
According to SPC's page for the arm, this is a "FOCUS/MAZDA ADJ REAR ARM"... it appears to fit anything with the Ford compact platform shared by the Focus and Mazda3. I wouldn't be surprised if it even fit a Volvo C30.
