There is certainly a difference in the UK. Bose sound and wind deflector ordered separately code 680 + code 551 totals GBP 1076. Bose in combination with wind deflector code P73 costs GBP 1030. You get a fabric type protector for the wind deflector, in lieu of a storeage box, should you want to take it off, with the combined option. No point at all ordering them separately, IMO.