I have been looking for on too for the past two days but couldn't find anything.
MCE doesn't even mention if theirs comes with a bezel or not. I'd rather not use the Superdrive at all than have a Frankenstein looking one with no face, not even mentioning the dust coming in or the utter lack of support for anything else than 10$ a piece Kodak DVDs as far as burning is concerned.
Get yourself a regular slim USB DVD burner, it will cost you less than 100$ and it will do a much better job than the SD. I have had a black Samsung that is very eye candy too and it's worked much better than the SD (burning Snow Leopard on a DVD-DL anyone 😀)
My guess is no one will ever make a bezel for the SD because they are changing with each MB generation and, let's face it, the number of people who swap their SD for an optibay are not legion... May not be worth the R&D + Production costs, whereas the optibays can be used with virtually any laptop (Mac or PC)... There is a much bigger market in that I suppose.
But by all means, if you do find one let us know because I'd buy it 🙂