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Just about any tire/wheel dealer in your area probably has an assortment in stock or can order them in within a few days at most. I was able to get mine from a local Discount Tire (in stock).
They are 60.1mm bore, like he said, the local Discount Tire should have them in stock. Or, if you had a set from your previous IS300, those will work on the IS350 too! hehe