$1600 US is still too much for factory wheels. You can pick them up for $800 US all day here in Cali and I doubt shipping would add up to that much more.

How wide depends on your tires sizes, ride height and the look you're going for. I wouldn't bother getting custom spacers made since the H&R's are readily available but if you insisted, maybe go with 35mm spacers all around to give it a bit more aggressive look. Or if they didn't have to match, do a pair of 35mm and another in 40mm, that way you can try them front/rear and see what you're preferred look is.

19x8.5 et 21 (w/35mm spacer)
19x8.5 et 16 (w/40mm spacer)

19x11 et 16 (w/35mm spacer)
19x11 et 11 (w/40mm spacer)

I just spoke to Porsche dealership in Brisbane who told me to buy brand new the Rims would be $3,800 AUD EACH!!! hahahah so pleeeeez tell me where I could find these for $800!!!

Also O3Z33, could you help me out with your awesome offset/spacer knowledge...
I have my stock set of base 18" rims for sale and a guy with a 2006 Audi A4 wants to buy them... I know the stud patterns are different but would the offsets work? Rep points for u for being awsum at this stuff hahah

bro buy some different rims

So much trouble for wheels, 35-40mm spacer is retarded.

The Audi won't work unless he's looking for major poke/stretch in the rear.
Front 18x8.0 et 43 is good for the Audi, will need new shorter tires to look right, also hubrings from 66.1 to 57.1 and some wobble bolts to fit 5x114.3 onto 5x112.

you dont need spacers u need adaptars. i ran 20mm adaptors on my VW when i was running porsche wheels and i had no problems what so ever and the look hot and different. i say go for it, call up H&R they should run about $500 for both. I had a jetta vr6 with a stage 2 turbo kit and i would spin tires all the way to 4th gear and never exp any vibrations or broken anything

Hey guys, new to the forum here. Got an 02 Q45 and have a set of 996 Turbo wheels from my last project. Was kinda looking for some adapters to mount these up depending on the costs. If you are in the US, stock Porsche wheels are cheap and easy to get. As the OP stated, good wheels in Australia is neither cheap nor easy to find. And I came across this a while ago.

"The current 2008 Nissan 350Z starts from $63,990 (interestingly the same car starts from only USD $29,205 in the U.S.,). The 2008 Porsche Cayman starts at $121,600 (USD $50,350 in the U.S.,) while the Audi TT starts from $68,900 (USD $35,200 in the U.S.,)"

exactly!! now u know what us poor australian folk have to put up with. luxury car prices are ridiculously inflated!!!
let me know how the adapters go. their is info and a link above i believe somewhere to the H&R adapters page. they have direct set used for nissan-> porsche conversion.
Let me know how they go coz im still tossing up over these porsche rims in Australia!! hahah

Pass on them. Seriously.... Buy wheels that are for your car, no second hand you always regret it later.

This^^

Buy those new volk trinitis or whatever they are on page 2.

I found a set of volks 19" with tires in Australia.....$6500USD:eek2: no wonder the OP is looking for adapters for those Porsche wheels.

u can get the adapters that change the bolt pattern if its something you really wanted to do...and it would work.