The Westfalia is just the towbar.
You buy the Volvo wiring from Volvo (Simon at FRF provides a discount to users of this site) or buy it from your dealer direct. The only difference to what Volvo will supply will be the towbar itself.
You only need the SW download if you need to have the car fog lights disabled when towing (so only if you tow a large trailer /caravan etc).
The volvo loom (7 pin or 13 pin) will disable the parking sensors when a lighting board is connected and shows the extra indicator light in the dash without the SW download.
I think the going rate from dealers for the SW download is around £50 so if you need it factor it in when comparing overall prices.
As I said before - the price you have is fair, I'd just consider if you like the idea of the cover on the Volvo bar and bear in mind it might not be Volvo that install it - they may sub that work out to a towbar fitters anyway.
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