All air suspension D3s had 7 seats, but not all were proper 'S' models, regardless of what the boot badge shows.Mine's an S with 7 seats....
The model line up went:
Base (5 seater without EAS or TR or Digital Climate Control).
7 seater (7 seats with EAS and TR and Digital Climate Control)
'S' (as 7 seater with Cruise Control Heated Front seats.
SE (as 'S' but had Power Leather seats, NAV, and upgraded audio system)
HSE (as SE but added glass roof, comedy wheels and some other bits and pieces.