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I'd get 15mm bolt on spacers, with those you won't need to change your OEM studs to extended ones. This will give you a net +30 offset which will be a nice fit at the fender and a much simpler install. B2 Auto Designs
Are those Infiniti wheels? If so they should have the same 66.1mm bore. If not, then you should get hub adapter rings that will get those wheel hubs to that 66.1mm size, then the hubcentric spacers will keep vibration to a minimum if any at all.
Ebay sells aluminum rings for about $10 and these work well vs. the cheap plastic ones that are sent w/ many aftermarket wheels.