I don't know exactly what will fit your alloys (e.g. whether they need specific wheel nuts), but as far as I can tell those McGard ones you've linked to on eBay are not the right ones. I've seen other people here on LOC say they've used them on the IS200, and whilst they will physically fit the OEM alloys, they're a different shape from the OEM wheel nuts, so I don't think they're right at all. The 21156 McGard nuts are a very close match for the OEM wheel nuts, and that's what I've got on mine.
As I say though, you'll need to check what will fit your alloys as well as fitting onto the OEM stud.