I think Classic is the way to go, but feel free to call MINI of the Hamptons. I bought a clear lens with a white bulb kit from myminiparts.com.
It also serves as a back-up light when wired in. Very simple install. If you choose to just do the rear fog, the wire harness is already there and you just pop off the cover, untape the harness and plug in the light.
I had my toggle bank/rear fog lights activated today for $50. So now that light lights up when I back up as well as when I switch it on forr use as rear fog lights.
I think you can also get a red lens and bulb from the site I listed above.