I've got a set of Thule bars in my garage, still yet to actually use them in anger but I will be doing in the next week or so when we head off on holiday (with a roof box attached rather than cycle racks). The Mk5 has locating pins for the bars under the front door gutters - covered by a rubber gromet.
I have trial fitted them but not loaded them up, the car specific feet and hooks ensure they lock in nice and tight. Mine were £60 off everybodies favourite auction site. Still holding out for some cheap 591 racks but they fetch £50 each second hand.