Thanks for the replies.
ForeigneRS, that's the thing, I think the part numbers ARE just for a 3dr Sierra switch, but dealers are telling me that they can't get them anymore from Ford. No longer available.
Simon, Are you sure a Sapphire switch would fit/do the job ??? I don't think my brother's too fussed about the leccy aerial so that would be ideal. Anyone any idea on a part number or anything??
Cheers !!