i was informed when buying wheels a year or 2 back that i wasn't allowd spacers cause they are elegal in vic. acturally i think it was the guys at the tyre factory in dandy that informed me of this.

Hub Adapters are legal in NSW so ive found out. Not in VIC though.

Spacers are NOT legal in any state.

Difference between the two is a hub adapter first gets bolted onto your hub then your wheel gets bolted onto the hub adapter which is already bolted to your hub, wherefor a spacer is just that, a spacer/washer like which can crack/snap off anytime.

Tempe Tyres, and Neils Wheels in Sydney have adapters for approx $75-85ea. But both places will include them in a deal with wheels if you buy a set from them.

I have the spacer 'hub version' on my EF XR6 - it works fine.... Noticed a bit of vibration around 90-120km...... Yet to rectify - but i think its either my front tyres (as the wheels came off a BA XR6 with about 60% rubber) or something like that..... Not a major problem but definately a thing ill be checking out in the next few weeks while my beast is getting a fresh coat of paint.