I am sorry to bring you bad news, but the color wheel on your model is only sold as part of the light engine, this is why you cannot find one....they never made spares. The only thing you can do if you have a bad color wheel is replace the entire light engine. Problem here is that the part is around $1300. The part number for your engine is 313912877911 I am sorry to bring you bad news.
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The color wheels are specific you would have to get one out of the same light engine.