As far as I can see it's advertised by Karl Green of Stoney Stanton in Leics, registered here as 'mgnumber49', owning (predictably) #049 in Starlight Silver. Nothing about being a Roush car though. He is the same guy who has the new diff and other 260 bits for sale on the 'Bay. Never a full 'green' member here, as far as I can see.
Personally I have no interest in the car, but if you are looking for an S/C car it could be worth trying to contact him?
Phone:07860 391645. Email:kgreen2006@fsmail.net ... I think, E&OE.