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Hi matsu,
Unfortunately real carbonfibre wing mirror casings are usually very expensive (over £200) unless you get very lucky. It's always a bit risky buying unseen off the likes of eBay too, but.
If you don't want to or can't spend on CF, a very effective and cheaper solution is carbon vinyl. Check Phi Mcavity's ride - It does look very good. However, I personally wouldn't mix carbon vinyl with the real stuff on the outside of a car where they can be viewed in comparison with each other - The vinyl then shows up the imperfections of the real, and the real carbon shows up that the vinyl isn't the real deal.