I think the standard carrier and sprocket is one piece. I have a separate Renthal carrier and sprocket on my 748 which allows you to change the sprocket without taking out the wheel, also you only need to replace the sprocket in future.
http://www.ebay.co.uk/itm/Renthal-Al...sAAOSwU9xUPmzl
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S4 Fogarty, S4R 07T, 748, Series 1 Mirage
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