So the inner mounting point on the front control arm is wider on the GD chassis correct? I have an extra set of AL control arms I wanted to use on a GC8 chassis, but if they won't work then I'll sell them off. I think I've read of someone using the GC8 AL arms on a WRX Wagon since the track is the same, but having to shim that mount since the mouting portion itself was too large.
The rear stuff I'm pretty sure is all the same, not including the 05 STI of course. I used a WRX rear knuckle on a GC8 car so I know the bottom trailing arm mount is the same.