The new Tesla Delivery Centre in London has a set of 19" Grey Cyclones in stock if anyone in Western Europe would like a set.
I just went in to pick up a set of cyclones for my grey MS and they offered both colours. Have to say on the grey car I think silver looks much better so that's what I bought. On red, black & white the grey wheels look fantastic but on the more "subtle" car colors I think the grey wheels just disappear a bit.