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17s wouldn't fit over your brakes and 8.5 width will barely fill your guards. I run 20s on my 350Z and the front pair are 8.5's but they are a very low offset so they fill the front guards. My rears are 10" wide and I wouldn't go any narrower on a 370Z unless it's a very low offset. If you want to have a play around with wheels and tyre sizes to see what they look like, check out http://rimtuck.com/
Also I am on my 4th set of Achilles tyres and I reckon they're awesome!
Sounds like the usual dealer/spare parts bullshit runaround to me. I contacted a dealer in Melb and asked for a price on the bumper and mentioned it was for a non-Nismo 370Z and was given a quote for the bumper, 2 lower moulds and the badge without a problem. If you're not happy with the response from your local dealer I'd call Nissan Customer Care (1800 035 035) or have another dealership order it for you and have it sent to your local dealer for pickup.
https://www.vicroads.vic.gov.au/safety-and-road-rules/vehicle-safety/vehicle-standards-information If you take a look at Vehicle Standards Sheet number 8 on this site, under section 13.7 it states: "To remain within the scope of this section of VSB 14, a vehicle fitted with ESC must not be modified if the operation of the ESC is affected" Since fitting rims & tyres of an identical rolling diameter to the stock setup won't affect the ESC, there is nothing unroadworthy about the wheel setup. This link shows the difference in size between the original setup on the rear, and the current setup: http://www.willtheyfit.com/index.php?width=245&aspect=45&diameter=18&wheelwidth=9&offset=15&width2=275&aspect2=35&wheel_size=19&wheel_width=10&offset2=20 You'll notice on the left hand side the difference in rolling diameter is negligible and the track width increases by 7.7mm (you're allowed to go 25mm wider in track in Vic). So the Vertinis aren't going to affect the roadworthiness of the car.