Think you can only do one before you register a new vehicle
http://www.lovellsauto.com.au/product12f.phpedit:
"Should A GVM Upgrade Be Fitted Before Or After Registration?
You Can Fit A GVM Upgrade Both Before & After Registration!
New vehicles can be fitted prior to registration as long as a ‘federal’ compliance kit is available. They are simply then registered with their new GVM as per the new compliance plate. This means that the vehicle is registered 'federally' with the GVM Upgrade. If the vehicle is sold or moved interstate then the compliance is still valid.
However as long as there is a state compliance kit available to suit your vehicle then you can also have a GVM fitted after the vehicle is registered. State compliance means that the GVM is only valid within the state that it is fitted & complied in. State compliance GVM upgrades also require the additional cost of the engineers inspection and sign off of the ugrade when it is completed. The vehicle may be driven Australia wide with the GVM being recognised nationally (under state registration), however if the vehicle is moved or sold interstate it will be required to be re-complied by an engineer for that particular state or territory."
From this site
http://www.statewide4x4.com.au/faq.aspxDouble edit: (should have actually clicked on what Steveyb posted first
Ok , garry, statewide is in Keilor in Melbourne ,i don't think they would be offering kits that are suspension only if their was more required?? Perhaps give them a ring on 03 9484 7838