I tried installing a set of Ichiba 15mm wheel spacers to push the wheels out to the fenders more. It didn't work out too well and ended up being a
no-go. The spacers went on just fine; the problem was with the wheels. This is all detailed in this thread here:
Spacers on stock Z?
Here are the spacers:
Mounted:
The stock studs are supposed to fit into the little gaps between the mounting holes of the wheel:
But the gaps aren't cut large enough:
And that means that you can't mount the wheels back onto the car properly once the spacers are mounted to the wheel hub.