Legal way to run 285s on a Defender in NSW?

I've been looking at this closely as I've bought some Twisted 18" alloys from the UK, and they had 3 different offset options (ET0, ET10 or ET25). The ET0's look the best to me, but I didn't think could legally be used here.

The Boost alloys may be ET33, but the Sawtooth alloys are ET20, which gives a little more room to increase the track and stay within the 25mm allowable change.

As the Sawtooths are a factory option on any Puma, you can fit ET10's without an issue, at least in Victoria.



If we are under MC or NA ADR category, and I can't find definitively that this is the case (but I presume it must be with the airbag, child seat anchor point exemptions etc), then I guess ET0 would be allowable as it's under 50mm change...

From what I've read, it's a 50mm change for 4wds before engineering is required , with certain defender models having +20mm as standard, this makes up to -5mm legal.
If your going 285/75r16 , zero offset 16x8 should be ok, but if your tempted by bigger rubber just get -25mm and 315/75 engineered as a third set of wheels is 1/2-3/4 the cost of an engineer cert.