Perhaps join up club.liberty.asn.au and ask there. Alternatively you could send King Springs an enquiry?
I have had king springs in a few of my previous cars but they were the lowered version.. I have never experienced the standard height springs from King Springs.
How do you mean add more performance? As in make the ride a little stiffer?
The sedan & wagon springs will differ if they are specified, due to the fact the wagon has a little more weight over the rear wheels. I know a few guys use some spacers in the rear if they have fitted sedan spec springs.