John, I don't know the p/n for this temperature switch for the 1100. But, I am curious why you need the p/n. Is your fan not cycling? If so, you're on the right sensor. The temperature sensor feeding the gauge is the one attached to the engine head.
Mine were and issue and were covered under warranty. Actually, the gauge turned out to be the culprit, twice on my RTV 900 XT.