So still no weights on the base model wheels/tires? I may have to just weight them myself.
Anyways, I was googling around for wheel weight and found a really nice post on another forum. It has some models and sizes not listed on the wheelweights.net spreadsheet(i have a feeling that thing is a bit out of date):
Wheel Weight Comparison - BMW M3 Forum (E90 E92)
The other nice thing is they are all pretty much right around the sizes you would be looking at for a 370z.