oops posted that before I read Garrys comments! As it happens I do have the carbon lower deck, although I haven't fitted it - I've been using the orignal style tub deck as per pic below. I don't really want to get into cutting that deck, or even (at the moment) fitting the carbon lower deck. So the hobbyking ones linked to above definitely won't fit? I'd just added four of them to my basket!! (haven't paid yet)