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I have a pair of 15mm and a pair of 20mm H&R wheel spacers. I had these on my 2005 Coupe and they should fit any G35. They can be installed without removing the hub and don't require rolling the fenders if you use the 20mm rear and 15mm front. These include the studs.
$120 shipped in continental US.
Note: even though one of the bags says 25mm, it's mismarked and they are actually 15mm and 20mm.
They work with stock hubs. You tap out the stock studs with a hammer, push the new ones in through the back of the hub and put the spacers and wheel on. You can use some washers to get the studs tight before you put the wheel on to make it a bit easier.
Yeah you definitely want to seat the studs before you put the wheels on, the OEM lug torque is only 80 ft/lbs and it takes a lot more than that to seat the studs, stack up some washers, buy a single open lug nug, run it down backwards so the taper is facing out, hit it with an impact wrench until you fully seat the new studs.
If you try to seat them with the wheel as the spacer you run a pretty good chance of screwing up the aluminum wheels which is very expensive compared to a half-dozen washers and 1 open lug nut.
Can these extended studs be used with the oem closed lug nuts?
Now I realize what you were asking. Yes, they are used with the regular OEM closed lug nuts, so you don't need new lugnuts. As long as you are using the spacers along with the longer studs, the studs are sized so that they protrude the same amount and your normal OEM lugnuts will still work.
I agree with above - definitely best to get them fully seated before putting the wheels on to avoid any risk to your wheels.
The 20mm are just barely small enough to get them in there with the hubs and parking brake still in place. There are a couple spots in the rotation of the hub where you can fit the stud past the parking brake. Once you find one of those spots, you just rotate each hole to that point and insert them one at a time.