depends whether the coilovers are servicable or not

afaik tein's can be done via fulcrum, bilstein can be done by bilstein direct(or rather a department which does their suspension), and koni's can be done by top performance

although fulcrum and top performance are in different states, i believe bilstein's in sydney
don't expect it to be a 5 minute job though, turnover time is 1-2 weeks from what they've quoted me