wheel size is no more than 25mm wider wheel than stock. so 8" is fine.
2" rules doesnt exist in vic. it is no more than 15mm bigger than stock tyre rolling diameter, and either 15mm smaller or 25mm smaller(cant remember which)
so as long as the tyre is correct rolling diameter, you can go as big a diameter wheel as you want.
most cops dont know wheel and tyre requirements, and will probably tell you the old 2" rule.
what i am typing is NOT my opinion, it is what i have learnt from reading on forums, and other websites.
read the wheel and tyre section in this pdf
http://www.vicroads.vic.gov.au/NR/rd...340/0/VSI8.pdf
it is part of the vehicle standards info for victoria
Vehicle standards information : VicRoads