'06 Tuono Spare Sprocket

My dealer received an additional (I assume, rear) sprocket with some of the '06s but not others. I haven't been able to get a tooth count from him so I'm not really sure what the intent is (mine was one of the ones that came without -- so they're ordering another from Aprilia). Anyone out there have one in hand? I'd just like a bit more information. Thanks.

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