I think you'll find if you have 19x8.5 rims you may poke a little bit as there are a number of us with 19x8 which sit pretty flush.
So the 245 width tyre will pull in a little more at the top and the 255 will poke a bit more but issue is really what width rims you're running as the bead will sit the same place regardless of 245/255 tyre width.
The 255/40/19 tyres that are spec'd (on your fuel filler flap) are designed to fit on 19x9 rims which are the standard 19" rim for Tigs (not sold in Aus though). The problem with this size is that the tyre/rim does extend past the guard so that's when you definitely need to fit the wheel arch extensions.... Group Buy EOI on Volkswagen Wheel Arch Extensions
I guess you'll find out when you fit your rims to the car whether you need the extensions or not....
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