Okay, update,
The S43 really don't work in the front, it is just too loose.
I just drove across the country (hello boston!) with a cargo box on top, but before I did, it was wobbling like crazy on the S43, so I traded in @ Rerack PDX, ($100 for used racks, suck!) and got a pair of the S53.
The S53w are the "correct" version for the B6/3C Passat Wagon, however, they are still ... not as sturdy as I would like.
It was good enough to take a loaded Cargobox across country, going 80 mph in Wyoming/Utah/Idaho.. and nothing fell apart, but it was not as sturdy as I would like.
So bottom line, S53w is correct, it has a longer front bar.. the S43 bars are the same lenght - and just too short to fully support weight on the Front end of a B6 Passat.
